https://video.joostrekveld.net/about/instance/homehttps://video.joostrekveld.net/videos/browse?scope=localhttps://video.joostrekveld.net/homehttps://video.joostrekveld.net/w/7D47g4gQDs7uo8BKk1gbtshttps://video.joostrekveld.net/lazy-static/thumbnails/66552c55-3a3e-4b5e-8a2c-346696d18190.jpg#43.4Short piece from 2012 commisioned for the ‘Modern Times’ project by Stichting Cinema Zuid in collaboration with the One Minutes, both in Amsterdam. Part of a long-running exploration of algorithms that are based on a combination of propagation and local interactions. Originally triggered by an encounter with simulations of how nerve impulses organise themselves into oscillations in tissues like heart muscle, the project later more generally explored the emergence of patterns in time and space out of homogenous starting conditions. More info [here](http://www.joostrekveld.net/wp/?p=1117). © 2012, Studio Joost Rekveld.https://video.joostrekveld.net/static/streaming-playlists/hls/35c3444b-7153-4948-8291-58101ffdec18/e3d767e7-5b22-4ecd-8c02-a87c7fe2fdaa-master.m3u8https://video.joostrekveld.net/videos/embed/7D47g4gQDs7uo8BKk1gbts735192026-09-02T10:36:23.847Zfilm/video worksYESjoostrekveldNOhttps://video.joostrekveld.net/w/nCTSkpyzpuncGEn93pKWYmhttps://video.joostrekveld.net/lazy-static/thumbnails/3e8b0f0a-77c8-4b81-a45c-4b4d30647b24.jpgMechanisms Common to Disparate Phenomena; #59 (trailer)Trailer of the film "Mechanisms Common to Disparate Phenomena; #59", (2023, 79 minutes, 2K DCP) by Joost Rekveld. An abstract animated science-fiction film that takes the experiences shared by humans and electronic circuits as its starting point. Our computing technology emerged during the Cold War as a byproduct of the development of atomic weapons and their associated planetary surveillance systems. In 1961, at what was perhaps the coldest point of this period, Edward Lorenz and Yoshisuke Ueda independently discovered deterministic chaos in their computers. In film #59, humans, aliens and electronic devices vacillate between these poles of a human fever dream of planetary control on the one hand, and lively machinic chaos on the other. All images in the film were produced as analog electronic signals, in a re-enactment of antiquated ways of computing. These signals were generated using period equipment, including an analog computer from 1963, early sonar and radar oscillators, and bits from military flight simulators. This film is an attempt to liberate these technologies from their problematic origins. Narrative elements derived from Cold War era science fiction films set the tone, while references to radar and television scanning result in images that evoke very early computer graphics. These progressively unfold into organic calligraphies, in which the negative space between the patterns becomes one of the protagonists. Resemblances with manmade phenomena are gradually left behind, and the film evolves into a nonverbal meditation on material processes, human perception and the arrow of time. More information can be found [here](http://www.joostrekveld.net/?p=2707).https://video.joostrekveld.net/static/streaming-playlists/hls/af36a6fb-3352-4fb2-a75d-444d933fa744/3cebac67-cdc0-41ca-9c8c-e5b62459ce61-master.m3u8https://video.joostrekveld.net/videos/embed/nCTSkpyzpuncGEn93pKWYm790172026-09-02T12:21:46.923Zfilm/video workstrailersYESjoostrekveldNOhttps://video.joostrekveld.net/w/7W48iYpbBik8TmEpeRhqqChttps://video.joostrekveld.net/lazy-static/thumbnails/e1bf9c80-be3a-4365-a233-1f0ba9d6025a.jpgUeda's Shattered Egg, Prologue to #59Joost Rekveld - "Ueda's Shattered Egg, Prologue to #59" (video, 2023, 15') Much of Joost Rekveld's work finds its inspiration in media history and the history of science. When considered as cultural phenomena and disconnected from notions of progress, these histories are a rich repository of ideas, many of them wrongly neglected and interesting to revisit. This work - and the longer film it is part of - are outcomes of Rekveld's long-running investigation into the practice and utopian ideas around analog computing. Its point of departure is a re-enactment of a concrete event: the discovery of deterministic chaos by Yoshisuke Ueda when working with the analog computer at Kyoto University on November 27, 1961. There are several origin stories of chaos theory, and the most well known is undoubtedly the story of Edward Lorenz and his digital calculator. Around the same time as Ueda, Lorenz discovered that a very small rounding error in his data resulted in large-scale divergence of the outcome of the weather model he was calculating. Years later this phenomenon became generally known as 'The Butterfly Effect'. Ueda's discovery was also made in collaboration with a calculating device, in this case an electronic analog computer constructed by a fellow doctoral student a few years his senior. When plotting the curves produced by a system of equations, Ueda noticed an irregularity, similar in shape to a 'shattered egg', that could not be accounted for by any malfunction or known mathematical explanation. Due to the hierarchical relations in the lab, Ueda's discovery was dismissed by his superiors for many years and it did not get published until the early 1970's, at the time of the student's protests in Japan. This work is also the prologue to Joost Rekveld's film "Mechanisms Common to Disparate Phenomena; #59" (DCP, 2023, 79'). More info [here](https://www.joostrekveld.net/?p=2707).https://video.joostrekveld.net/static/streaming-playlists/hls/3822ec09-e0e5-4d93-ba21-6643fa9fc164/28936c5b-e830-41c8-a937-ccf1031e8fd8-master.m3u8https://video.joostrekveld.net/videos/embed/7W48iYpbBik8TmEpeRhqqC988042026-09-02T19:32:59.991Zfilm/video worksYESjoostrekveldNOhttps://video.joostrekveld.net/w/bTghXbhcuK7EQrMzhCc5Vihttps://video.joostrekveld.net/lazy-static/thumbnails/70b8d181-c240-4628-8988-3709b51516f1.jpgfieldplotting testFirst experiments from 2021 with automatically tracing the electrical fields in resistive paper with copper electrodes. The left machine traces the field: the Comdyna analog computer at the back drives the X-axis and adjusts the Y-axis so that the probe follows an equipotential line. The right machine copies the movement because it is driven with the same XY voltages and draws the lines on paper. This use of resistive paper to model all kinds of field equations was invented in the 1920s and was very common until well into the 1960s and 1970s. Just after the second world war it was used extensively for modelling air flows around supersonic planes and rockets. Later it was used to model electron trajectories in tubes, accelerators and in the first integrated circuits. In the Netherlands it was used for modelling water flows through dikes. It is an almost forgotten technique that is very elegant and simple: it can be done by hand with hardly any tools and it can be used without understanding any of the math involved. It is a directly analog and truly two-dimensional way to compute.https://video.joostrekveld.net/static/streaming-playlists/hls/5823be39-5a36-4cf6-8bdc-58c97bf9685b/ab704c5d-3505-44b3-a130-f72e3af1a450-master.m3u8https://video.joostrekveld.net/videos/embed/bTghXbhcuK7EQrMzhCc5Vi222072026-09-02T12:58:15.039ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/1RY99ukURvn9tQCD5aF9kehttps://video.joostrekveld.net/lazy-static/thumbnails/031e5824-0924-489d-a922-f33a202c4c54.jpgplotting a chaotic attractor - more complexPlotting a more complex version of the chaotic system that I was developing in 2020. These equations were running on an EAI TR-48 analog computer from 1963.https://video.joostrekveld.net/static/streaming-playlists/hls/06fa0ae2-37c7-4cc8-9441-6d85a9425ce3/289cbad1-39dc-47be-8954-d2efdd5d5510-master.m3u8https://video.joostrekveld.net/videos/embed/1RY99ukURvn9tQCD5aF9ke756022026-09-02T12:42:26.615ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/2kNz87FtRXPRqWS6DqUFj2https://video.joostrekveld.net/lazy-static/thumbnails/8fc82b89-e842-4b10-b043-ea0e600124ab.jpgplotting a chaotic attractor - fasterPlotting a chaotic system that I was developing in 2020, after finding out that plotting 10x faster works too. These equations are running on an EAI TR-48 analog computer from 1963.https://video.joostrekveld.net/static/streaming-playlists/hls/0adcf882-4bc9-469a-9bfd-824e020a4c91/a02c196a-a4d1-4fb8-9aef-3a650fa10e12-master.m3u8https://video.joostrekveld.net/videos/embed/2kNz87FtRXPRqWS6DqUFj2179002026-09-02T12:42:28.629ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/nAmZ7ecS6R9qPMZVDE4zkjhttps://video.joostrekveld.net/lazy-static/thumbnails/bb7dd7b6-5d77-40dc-9dd6-3148e2721725.jpgplotting a chaotic attractorPlotting a chaotic system that I was developing in 2020. These equations were running on an EAI TR-48 analog computer from 1963.https://video.joostrekveld.net/static/streaming-playlists/hls/aedc21dc-202d-4ef5-b3ab-fefe996f79bc/f04db188-c553-4333-a5ab-49ac01c5d72d-master.m3u8https://video.joostrekveld.net/videos/embed/nAmZ7ecS6R9qPMZVDE4zkj642012026-09-02T12:49:21.250ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/uNHdjf2x7J1ViNL7qYTWa7https://video.joostrekveld.net/lazy-static/thumbnails/04d8856a-9575-45a1-b047-7001cddd5c2b.jpgplotting a chaotic attractorPlotting a chaotic system. These equations were formulated in 2008 by Wang Lin at Huazhong University in Wuhan. The system is running on an EAI TR-48 analog computer from 1963.https://video.joostrekveld.net/static/streaming-playlists/hls/e9457e6f-d32d-4fd9-bf7a-6583ccaa4fa0/cb12ebeb-30dd-48c4-9eae-0ab1127c21a3-master.m3u8https://video.joostrekveld.net/videos/embed/uNHdjf2x7J1ViNL7qYTWa7121002026-09-02T13:04:12.359ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/tXcCv1p8BQqDXzpLGnd2gYhttps://video.joostrekveld.net/lazy-static/thumbnails/77cd740e-45dd-4140-8a6a-ccfdc97eaf80.jpganother radar display capture from #71.1A second recording of the radar display tube in my installation #71.1 from 2019. These images are typical, but the image transitions in the installation are much more gradual. The images and sounds are generated by custom built analog electronics and will never repeat. The sound on this clip is captured with the microphone in the camera, so the quality is not ideal. More info [here](https://www.joostrekveld.net/?p=2179).https://video.joostrekveld.net/static/streaming-playlists/hls/e25bd167-ab0a-4a70-9188-ab77dd0acd72/b837a1e6-ab7c-4f7b-b858-4abe30766d7e-master.m3u8https://video.joostrekveld.net/videos/embed/tXcCv1p8BQqDXzpLGnd2gY298052026-09-02T13:07:20.686ZinstallationsYESjoostrekveldNOhttps://video.joostrekveld.net/w/7Gmgo8S6ajgWyArySeLASThttps://video.joostrekveld.net/lazy-static/thumbnails/c681eef4-bf9c-47f5-ad79-a238184f1bde.jpgradar display tube capture from #71.1Video recording of the radar display tube in my installation #71.1 from 2019. These images are typical, but the image transitions in the installation are much more gradual. The images and sounds are generated by custom built analog electronics and will never repeat. The sound on this clip is captured with the microphone in the camera, so the quality is not ideal. More info [here](https://www.joostrekveld.net/?p=2179).https://video.joostrekveld.net/static/streaming-playlists/hls/36391256-95a3-45e3-ba30-9bd001310cbf/8cd85c33-9460-413a-a465-6634a449ca28-master.m3u8https://video.joostrekveld.net/videos/embed/7Gmgo8S6ajgWyArySeLAST130012026-09-02T13:17:27.733ZinstallationsYESjoostrekveldNOhttps://video.joostrekveld.net/w/dgMWsWWXMmx4uadD87ov3phttps://video.joostrekveld.net/lazy-static/thumbnails/58144244-5ffc-4002-a5bc-52eb5df045f2.jpg#71.1 oscillator test 1Developing and testing the electronics for scaling, clipping and rotating of the signals produced by a custom built chaotic oscillator. In preparation for my installation #71.1 from 2019, see more info [here](http://www.joostrekveld.net/?p=2179).https://video.joostrekveld.net/static/streaming-playlists/hls/636221a4-3bc6-4cc2-a8ff-3fd85575ed0f/7fbc7ab7-d58e-49c8-a906-31cff1abeb88-master.m3u8https://video.joostrekveld.net/videos/embed/dgMWsWWXMmx4uadD87ov3p138012026-09-02T13:21:53.642ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/h1c3Uqxd96LYHjKJN1Auj7https://video.joostrekveld.net/lazy-static/thumbnails/44e7d9fd-d3e9-4dcc-bef1-2e0a5fc33d12.jpg#71.1 oscillator test 2Developing and testing the electronics for scaling, clipping and rotating of the signals produced by a custom built chaotic oscillator. In preparation for my installation #71.1 from 2019, see more info [here](http://www.joostrekveld.net/?p=2179).https://video.joostrekveld.net/static/streaming-playlists/hls/81990745-8f56-43a6-ba17-91cdad8fa61a/b0e79b88-04cd-4dad-972f-e1546a6ac640-master.m3u8https://video.joostrekveld.net/videos/embed/h1c3Uqxd96LYHjKJN1Auj783002026-09-02T13:23:45.270ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/ucRzQaoFjCmA6c4gXU67BQhttps://video.joostrekveld.net/lazy-static/thumbnails/0c99a258-0a73-4cba-bced-3d9962aed1d3.jpg#71.1 oscillator test 3Developing and testing the electronics for scaling, clipping and rotating of the signals produced by a custom built chaotic oscillator. In preparation for my installation #71.1 from 2019, see more info [here](http://www.joostrekveld.net/?p=2179).https://video.joostrekveld.net/static/streaming-playlists/hls/e4679ee8-5e5b-40b2-89d1-2599fb6e989e/4f5da48a-6353-4262-8933-2c0e688fe6c1-master.m3u8https://video.joostrekveld.net/videos/embed/ucRzQaoFjCmA6c4gXU67BQ114052026-09-02T13:28:07.185ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/pAfJP8gsa9iXjgaDbMbKcmhttps://video.joostrekveld.net/lazy-static/thumbnails/eebc493a-1628-4a63-91d4-d540b2ffba30.jpgfirst encounter with vidicon tubeFirst encounter with a scientific high-resolution video camera from 1976.https://video.joostrekveld.net/static/streaming-playlists/hls/bf0a8f60-70ec-4fa1-9f8d-8bcae5d20dfe/3c66349e-6e02-416f-a044-6f4bff29cf05-master.m3u8https://video.joostrekveld.net/videos/embed/pAfJP8gsa9iXjgaDbMbKcm100052026-09-02T13:32:16.289ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/aTqzvVGCni7SEFrD9heC1Hhttps://video.joostrekveld.net/lazy-static/thumbnails/90899d08-a1e5-4555-83e5-d7a44013d213.jpgradar tube test for #71A short test with oscillographic patterns on a brand new Dumont 5AQP7 radar display tube from 1964. This tube has P7 phosphor, which is a two stage phosphor: the blue phosphor is fast (milliseconds) and triggers the yellow phosphor which is very slow (seconds). Part of preparations for an installation called #71 in which this type of radar tube is used, figuring out how to drive and modulate it.https://video.joostrekveld.net/static/streaming-playlists/hls/501053ac-c7d9-421a-b800-aead0e110401/f1f0371d-ade7-4c2d-9444-eef1aea692fe-master.m3u8https://video.joostrekveld.net/videos/embed/aTqzvVGCni7SEFrD9heC1H17002026-09-02T13:36:44.584ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/adfKFHUtqjmLihxoFvorULhttps://video.joostrekveld.net/lazy-static/thumbnails/784bf6da-726b-4d45-8d96-805cd0db0565.jpgexperiment07 test 8Yet another short XYRGB analog vector display experiment exploring the space between raster processing and oscillographics. Made with fast and slow analog computing modules and some Tektronix signal generators. During these experiments I unexpectedly encountered this curious perpetual zoom. Part of the experiments leading up to my film "Mechanisms Common to Disparate Phenomena; #59".https://video.joostrekveld.net/static/streaming-playlists/hls/4a9843e1-2d96-4aaf-bd2e-626a0140e318/346c1afb-b833-4e7f-a50a-3223169b95e9-master.m3u8https://video.joostrekveld.net/videos/embed/adfKFHUtqjmLihxoFvorUL19002026-09-02T13:41:01.133ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/6szg5XNuLuoF5hADqQNA38https://video.joostrekveld.net/lazy-static/thumbnails/86a3841c-ad72-44bf-b31a-ff2518e046f7.jpgexperiment07 test 6During my XYRGB analog vector display experiments, I unexpectedly encountered this curious perpetual zoom, somewhat reminiscent of what the Shepard tone does in audio (later I found out how to control the speed of the apparent zoom and have it reverse direction). Effects like these have been around: I have seen similar things (and a lot more) in some of Ken Jacobs' work. Made with fast and slow analog electronic computing modules and some Tektronix signal generators. Part of the experiments leading up to my film "Mechanisms Common to Disparate Phenomena; #59".https://video.joostrekveld.net/static/streaming-playlists/hls/2c338751-2a34-44e1-87d2-c3b97b6ffcb3/ee6d1341-1252-447e-9e69-be1ce14bab0f-master.m3u8https://video.joostrekveld.net/videos/embed/6szg5XNuLuoF5hADqQNA3815002026-09-02T13:53:18.485ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/eRcaGWjGorNifH5N3T4Kyohttps://video.joostrekveld.net/lazy-static/thumbnails/9613c319-21b4-469d-badb-1fc4a20b3799.jpgexperiment07 test 5Another short XYRGB analog vector display experiment; a quick test of colour offsets and gradients. Made with fast and slow analog computing modules and some Tektronix signal generators. Part of the experiments leading up to my film "Mechanisms Common to Disparate Phenomena; #59".https://video.joostrekveld.net/static/streaming-playlists/hls/70252122-3a86-42a0-8083-8707da3872ca/7f2e0ae2-fcd6-432a-b74c-d724c5b3a9c3-master.m3u8https://video.joostrekveld.net/videos/embed/eRcaGWjGorNifH5N3T4Kyo47012026-09-02T13:55:08.372ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/r1SjJVKrZMc4nuAPQx9NT7https://video.joostrekveld.net/lazy-static/thumbnails/1ad7017d-729e-47d2-8ac1-5235d03357d5.jpgexperiment07 test 3Another short XYRGB analog vector display experiment exploring the space between raster processing and oscillographics. Made with fast and slow analog computing modules and some Tektronix signal generators. Part of the experiments leading up to my film "Mechanisms Common to Disparate Phenomena; #59". (Video compression has trouble handling fine hard-edged detail, delicate colours, fast movements and 60 fps, and that is what this is...)https://video.joostrekveld.net/static/streaming-playlists/hls/ca937aad-dba2-45ff-8f6b-9de6575558fc/32b39049-c17a-49f0-82f0-f0e5ffd2f628-master.m3u8https://video.joostrekveld.net/videos/embed/r1SjJVKrZMc4nuAPQx9NT7182002026-09-02T13:58:49.977ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/7hkdqtAYytmSWBhZsLeuf5https://video.joostrekveld.net/lazy-static/thumbnails/e260bae9-1f63-4858-9138-c662e7c462e8.jpgexperiment07 test 2Another short XYRGB analog vector display experiment exploring the space between raster processing and oscillographics. Made with fast and slow analog computing modules and some Tektronix signal generators. Part of the experiments leading up to my film "Mechanisms Common to Disparate Phenomena; #59". (Video compression has trouble handling fine hard-edged detail, delicate colours, fast movements and 60 fps, and that is what this is...)https://video.joostrekveld.net/static/streaming-playlists/hls/32de92cc-98a2-4314-a120-9ac007de1b68/0493e879-db98-4f77-8abc-b40d81b23f75-master.m3u8https://video.joostrekveld.net/videos/embed/7hkdqtAYytmSWBhZsLeuf51420132026-09-02T14:04:23.118ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/5dkHjS9GJ9gEKGYU4zBzmHhttps://video.joostrekveld.net/lazy-static/thumbnails/7d901964-17bc-4df4-80ab-6f1203cc138d.jpgexperiment07 test 1 with Folsom stroke-to-raster converterA small XYRGB analog vector display experiment, captured with a Folsom stroke-to-raster converter. Part of the experiments leading up to my film "Mechanisms Common to Disparate Phenomena; #59". (mangled quite a bit by the video compression)https://video.joostrekveld.net/static/streaming-playlists/hls/221da0cd-f0ba-411b-9d68-e3e38d7300bd/476b7559-699c-44a9-8ac2-abf3caf17f0a-master.m3u8https://video.joostrekveld.net/videos/embed/5dkHjS9GJ9gEKGYU4zBzmH44002026-09-02T14:04:24.116ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/fLsedQkmb8uPSXhoGu8ecXhttps://video.joostrekveld.net/lazy-static/thumbnails/b982872b-1ea7-4b6b-be45-5b218f5f0021.jpgexperiment07 test 1 captured from XY displayA fairly random early analog vector display experiment from 2018, captured with a camera from a Tektronix 608 XY display. Part of the experiments leading up to my film "Mechanisms Common to Disparate Phenomena; #59".https://video.joostrekveld.net/static/streaming-playlists/hls/7794d4a6-cb4f-4dd5-b6f1-b565e9ecdbe1/74502933-d808-4a85-86dd-46e072ae1bb2-master.m3u8https://video.joostrekveld.net/videos/embed/fLsedQkmb8uPSXhoGu8ecX44042026-09-02T14:09:25.136ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/pMGwULshrXfSDce27WxN84https://video.joostrekveld.net/lazy-static/thumbnails/0a812ab7-1ab3-45b1-af52-439aae429cb1.jpgrelaxation oscillators test 8Analog video experiments with 7 relaxation oscillators that I built in 2018. All 7 oscillators are driven with the same sweep. The relaxation oscillators switch between subharmonics of the driving frequency. Some of the transitions are marked by regions of instability, as first noted by Van Der Pol in 1927.https://video.joostrekveld.net/static/streaming-playlists/hls/c0a3a35c-b83b-421e-92f2-e371abf80fc9/2613fd78-b717-4484-b1be-5fb65b820054-master.m3u8https://video.joostrekveld.net/videos/embed/pMGwULshrXfSDce27WxN84154072026-09-02T14:16:35.315ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/hsHusfvnKKmyh2E7Uzh37ohttps://video.joostrekveld.net/lazy-static/thumbnails/efefc48b-b2cf-46dc-bca2-10e519e4fdf9.jpg#11, Marey <-> Moiré (fragment)A fragment from #11, Marey <-> Moiré (35mm scope, 21 min, 1999), a film in which all images were generated by intermittently recording the movement of a line. It is a film about the discontinuity that lies at the heart of the film medium. More information on this film [here](http://www.joostrekveld.net/wp/?p=50).https://video.joostrekveld.net/static/streaming-playlists/hls/854d2044-9ef2-4dc6-b4d1-ca7f3a94574a/668facae-828c-4ab4-83ec-a9651ef493b8-master.m3u8https://video.joostrekveld.net/videos/embed/hsHusfvnKKmyh2E7Uzh37o89082026-09-02T14:26:25.480Zfilm/video worksYESjoostrekveldNOhttps://video.joostrekveld.net/w/mf7WUX9cuG9keP7v3dr552https://video.joostrekveld.net/lazy-static/thumbnails/7367c465-dcd9-4a2c-85c9-2284adc4d548.jpg#67 (fragment)A fragment from the video #67 by Joost Rekveld (2017, 17 minutes). As a tribute to'Reminiscence' and 'Telc' by Steina and Woody Vasulka, this analog HD video work is guided by the concept of 'reafference', a term that refers to the perceptual changes that occur when we move our body. In #67, we take a stroll through the electromagnetic worlds of machines and humans, structured by the fundamental frequency of power lines and the analog video signal. More information [here](https://www.joostrekveld.net/wp/?p=1931). This work was commissioned in 2017 by the LIMA archive for Media Art in Amsterdam as part of 'Unfold', a project that investigates re-interpretation as a strategy for the preservation and activation of media art works. It was financially supported by the Creative Industries Fund NL and the Mondriaan Fund. Produced by Studio Joost Rekveld Distributed by LIMA, Arie Biemondstraat 111, 1054 PD Amsterdam, The Netherlands [www.li-ma.nl](https://www.li-ma.nl).https://video.joostrekveld.net/static/streaming-playlists/hls/a3ef7792-ae2d-4d77-bcbd-cb3637d76ca1/6e7676a8-c6c2-434c-b208-89b4fafafed3-master.m3u8https://video.joostrekveld.net/videos/embed/mf7WUX9cuG9keP7v3dr55256032026-09-02T14:36:29.590Zfilm/video worksYESjoostrekveldNOhttps://video.joostrekveld.net/w/7rXLUzos6o4foxG2Z4K91Hhttps://video.joostrekveld.net/lazy-static/thumbnails/c4e191ed-a959-42f3-897d-d08e1771b9da.jpgrelaxation oscillators test 7Analog video experiments with 7 relaxation oscillators that I built in 2018. Oscillator 1 and 2 are driven with the same sweep. The relaxation oscillators switch between subharmonics of the driving frequency. Some of the transitions are marked by regions of instability, as first noted by Van Der Pol in 1927.https://video.joostrekveld.net/static/streaming-playlists/hls/3436cc5e-355f-4e27-a4d9-a3063a289b11/19b88e75-c8b7-4bb8-84c2-4bfc5d0fd24e-master.m3u8https://video.joostrekveld.net/videos/embed/7rXLUzos6o4foxG2Z4K91H38002026-09-02T16:18:35.713ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/pJk2bHBsSkSrXNr21CtBXHhttps://video.joostrekveld.net/lazy-static/thumbnails/1d76fa66-b0ca-4964-8b4c-2db4a14d1461.jpgrelaxation oscillators test 3Analog video experiments with 7 relaxation oscillators that I built in 2018, trying to push two of them to the highest frequencies I could manage. The relaxation oscillators switch between subharmonics of the driving frequency. Some of the transitions are marked by regions of instability, as first noted by Van Der Pol in 1927.https://video.joostrekveld.net/static/streaming-playlists/hls/c02b2636-db5d-4fe1-9242-c2cc8ee7c5c3/f3cb5e07-f5eb-41bb-b206-08b706594bec-master.m3u8https://video.joostrekveld.net/videos/embed/pJk2bHBsSkSrXNr21CtBXH108002026-09-02T16:21:55.476ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/1HvzCqzsCo7XVMmiV2f21Khttps://video.joostrekveld.net/lazy-static/thumbnails/89903ad6-bd37-4ab9-92e0-fa0d03659b15.jpgrelaxation oscillator test 1First experiments with 7 relaxation oscillators that I built in 2018. One oscillator is being driven with a constant frequency while its own frequency is being increased. The relaxation oscillators switch between subharmonics of the driving frequency. Some of the transitions are marked by regions of instability, as first noted by Van Der Pol in 1927.https://video.joostrekveld.net/static/streaming-playlists/hls/05cbb948-ac16-4636-9880-3d030e7bf9ef/707f53b0-9ec3-496c-ac91-4ebc49840161-master.m3u8https://video.joostrekveld.net/videos/embed/1HvzCqzsCo7XVMmiV2f21K68002026-09-02T16:25:26.784ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/cUA8JVAptcmDBU97XhTuS1https://video.joostrekveld.net/lazy-static/thumbnails/9c5d73f3-b666-4575-a26e-6caf52657471.jpgexperiment04 test 3An experiment from 2017 involving Tektronix signal generators, an analogue computer from 1963 and a system of equations demonstrating chaotic behaviour. An experiment leading up to my video [#57](https://www.joostrekveld.net/wp/?p=2070) from 2017. Video compression is really not kind to these images.https://video.joostrekveld.net/static/streaming-playlists/hls/606c3c9d-f9b2-423e-ac76-3ef5c385671c/9c60857f-ed5d-4678-bde5-0ba0f39c1354-master.m3u8https://video.joostrekveld.net/videos/embed/cUA8JVAptcmDBU97XhTuS1322002026-09-02T16:32:21.921ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/dSDg1HxQThHxoLMCMMzuZbhttps://video.joostrekveld.net/lazy-static/thumbnails/685122a3-dec3-435c-8dbe-c8f0ae2b1ec8.jpgexperiment04 test 1An experiment from 2017 involving Tektronix signal generators, an analogue computer from 1963 and a system of equations demonstrating chaotic behaviour. Part of explorations leading up to my video [#57](https://www.joostrekveld.net/wp/?p=2070) from 2017. Video compression is really not kind to these images.https://video.joostrekveld.net/static/streaming-playlists/hls/683fd061-c674-425f-b3ec-f1b38d14ba7c/32291005-46fc-4338-a20a-c7cb0a1b3031-master.m3u8https://video.joostrekveld.net/videos/embed/dSDg1HxQThHxoLMCMMzuZb239012026-09-02T16:39:26.463ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/dVWzvThkffMYfiGt11wp4Thttps://video.joostrekveld.net/lazy-static/thumbnails/5334d028-58f2-43b9-a16b-541f930fcba3.jpgWang's four-scroll oscillator test 6Experiments from 2017 exploring Wang's chaotic four-scroll oscillator on an EAI TR-48 analog computer from 1963 in fast rep-op mode. Parameter 'a' is appr. 3.5, and 'b' is being varied from 0.0 to appr. 0.8. The calculation is reset appr. twice a second and the trajectory is manually rotated around the X-axis from time to time, to get a sense of the 3d shape of the attractor. The TR-48 is not really designed for these speeds, so the calculation and parameter values are less precise than usual, due to the difference in frequency response of the various modules. The clip ends with an amplifier overload for that reason. The equations are: ẋ = x − yz ẏ = x − by + xz ż = −az + xy https://video.joostrekveld.net/static/streaming-playlists/hls/68b5b7f1-3703-4cf3-9ee9-b143a431d18d/87339cf2-48e1-46ce-a9ad-d8953146b722-master.m3u8https://video.joostrekveld.net/videos/embed/dVWzvThkffMYfiGt11wp4T246002026-09-02T16:48:17.750ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/22oCF8UE7ss26xr6wphia3https://video.joostrekveld.net/lazy-static/thumbnails/f6bc81bf-306a-4d1b-80bf-ead2b4ba3f45.jpgWang's four-scroll oscillator test 5Experiments from 2017 exploring Wang's chaotic four-scroll oscillator on an EAI TR-48 analog computer from 1963 in rep-op mode. Parameter 'a' is being varied from 6.0 to 2.0 while 'b' is kept at 1.0. The trajectory is manually rotated around the X-axis from time to time, to get a sense of the 3d shape of the attractor. The TR-48 is not really designed for these speeds, so the calculation and parameter values are less precise than usual, due to the difference in frequency response of the various modules. The equations are: ẋ = x − yz ẏ = x − by + xz ż = −az + xy https://video.joostrekveld.net/static/streaming-playlists/hls/084ad481-19f9-4020-8701-10c0295733e0/a8811c10-1c9a-48f4-aa09-20f76d8fbfd9-master.m3u8https://video.joostrekveld.net/videos/embed/22oCF8UE7ss26xr6wphia3116002026-09-02T16:53:28.553ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/5QAsMg1WMV1giT5WdLQtW5https://video.joostrekveld.net/lazy-static/thumbnails/dcf2e1d6-ad17-4271-a3a1-8c59aa434c0d.jpgWang's four-scroll oscillator test 4Experiments from 2017 exploring Wang's chaotic four-scroll oscillator on an EAI TR-48 analog computer from 1963 in fast, continous mode. Parameter 'a' is 3.0, and 'b' is being varied from 0.0 to 2.0. The trajectory is manually rotated around the X-axis from time to time, to get a sense of the 3d shape of the attractor. The equations are: ẋ = x − yz ẏ = x − by + xz ż = −az + xy https://video.joostrekveld.net/static/streaming-playlists/hls/272d7e4f-2aef-45f2-86c8-a4c5e0ee0d4c/7292af8c-9093-419d-a2b2-a9dcc0bd3312-master.m3u8https://video.joostrekveld.net/videos/embed/5QAsMg1WMV1giT5WdLQtW5144012026-09-02T17:01:52.680ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/spVisYbknzKhhn4WaAiEpdhttps://video.joostrekveld.net/lazy-static/thumbnails/b5eec465-1441-4354-9029-f5426724161a.jpgWang's four-scroll oscillator test 2Experiments from 2017 exploring Wang's chaotic four-scroll oscillator on an EAI TR-48 analog computer from 1963 in rep-op mode. The calculation is being reset to initial conditions appr. twice a second. Parameter 'a' is being varied from 6.0 to 1.5. The equations are: ẋ = x − yz ẏ = x − by + xz ż = −az + xy https://video.joostrekveld.net/static/streaming-playlists/hls/d5e48f52-7929-4504-a324-af3f1cf64202/48210254-75f2-4cee-8591-b76382f1b319-master.m3u8https://video.joostrekveld.net/videos/embed/spVisYbknzKhhn4WaAiEpd173012026-09-02T17:13:30.803ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/whKgg89oE5P3s9NTcRoAjNhttps://video.joostrekveld.net/lazy-static/thumbnails/72590d48-e0a2-4e71-9c2a-81ab428650c6.jpgWang's four-scroll oscillator test 3Experiments from 2017 exploring Wang's chaotic four-scroll oscillator on an EAI TR-48 analog computer from 1963 in fast, continuous mode. Parameter 'a' is being varied from 6.0 to 1.7. The equations are: ẋ = x − yz ẏ = x − by + xz ż = −az + xy https://video.joostrekveld.net/static/streaming-playlists/hls/f548b8d2-8715-4efa-8191-8d8efa117e2a/5a04101f-e957-4baf-b006-fcdd3c33588d-master.m3u8https://video.joostrekveld.net/videos/embed/whKgg89oE5P3s9NTcRoAjN173002026-09-02T17:10:26.010ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/9DsMDC97235MyPrvru4AdXhttps://video.joostrekveld.net/lazy-static/thumbnails/7bab53e3-7af4-4ef7-ac69-c9ba4b896106.jpgWang's four-scroll oscillator test 1Experiments from 2017 exploring Wang's chaotic four-scroll oscillator on an EAI TR-48 analog computer from 1963 in fast, continous mode. Parameter 'b' is being varied from 0.0 to 2.0. The equations are: ẋ = x − yz ẏ = x − by + xz ż = −az + xy https://video.joostrekveld.net/static/streaming-playlists/hls/4604230a-262c-4159-b4c2-67309637594f/def8bfce-ec05-4fb7-afcd-6245c85c850b-master.m3u8https://video.joostrekveld.net/videos/embed/9DsMDC97235MyPrvru4AdX230012026-09-02T17:16:26.996ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/sYtBsKBYa5JJmqH8MUMxbkhttps://video.joostrekveld.net/lazy-static/thumbnails/19936173-dec2-4779-bfa9-9a28acff86b4.jpgNosé–Hoover oscillator test 3Experiments from 2017 exploring the chaotic Nosé–Hoover oscillator on an EAI TR-48 analog computer from 1963, playing around with two parameters.https://video.joostrekveld.net/static/streaming-playlists/hls/da7045bc-a984-4cf8-b171-8e991c96f95b/7572ee0f-9ecb-4ab4-a4bd-3ef41332e952-master.m3u8https://video.joostrekveld.net/videos/embed/sYtBsKBYa5JJmqH8MUMxbk285002026-09-02T17:20:49.302ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/hnfnc3N4JsS47nwBp66dffhttps://video.joostrekveld.net/lazy-static/thumbnails/f2c26ac8-6909-485c-817c-cf3f0c5efe7a.jpgNosé–Hoover oscillator test 2Experiments from 2017 exploring the Nosé–Hoover Oscillator on an EAI TR-48 computer from 1963, varying one parameter linearly from 0.0 to 2.0. The computer is in rep-op mode, so appr. twice a second the calculation is reset to initial conditions.https://video.joostrekveld.net/static/streaming-playlists/hls/8489b0d1-4676-4b76-8798-22234cd85922/0a4de882-42ef-4af7-a4ea-3a17f74aa175-master.m3u8https://video.joostrekveld.net/videos/embed/hnfnc3N4JsS47nwBp66dff205522026-09-02T17:23:34.315ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/ouUsmm3cBruZWZU6noNJVMhttps://video.joostrekveld.net/lazy-static/thumbnails/33d66541-93c5-4d83-9af4-57442d36ea29.jpgNosé–Hoover oscillator test 1Experiments from 2017 exploring the chaotic Nosé–Hoover Oscillator on an EAI TR-48 analog computer from 1963, varying one parameter linearly from 0.0 to 2.0.https://video.joostrekveld.net/static/streaming-playlists/hls/b63233c3-bbce-4ea4-b55c-33f774e17707/eee49fbe-5476-4322-a1a4-6b023b7413ac-master.m3u8https://video.joostrekveld.net/videos/embed/ouUsmm3cBruZWZU6noNJVM219002026-09-02T17:30:07.893ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/oDW5uMsBDkjErS8GtfpCV9https://video.joostrekveld.net/lazy-static/thumbnails/3d6c028a-f771-4414-8852-57da1c280ec5.jpgFG504 test 4Exploratory analog HD videosynthesis experiments from 2017 using several Tektronix FG504 signal generators.https://video.joostrekveld.net/static/streaming-playlists/hls/b774e57e-d869-47df-b2a3-307a128eb4f2/74dcafc2-d05e-45af-84aa-af62e5b010dd-master.m3u8https://video.joostrekveld.net/videos/embed/oDW5uMsBDkjErS8GtfpCV9129012026-09-02T17:37:37.956ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/a8sV92Pf2BsNkfqc2YbzRzhttps://video.joostrekveld.net/lazy-static/thumbnails/ed274298-9042-4bfb-bab7-9e7cef92d1d7.jpgFG504 test 3Exploratory analog HD videosynthesis experiments from 2017 using several Tektronix FG504 signal generators. https://video.joostrekveld.net/static/streaming-playlists/hls/49ed0ac1-877a-4321-8a32-308cfab6684f/666be5f0-30ce-4fc2-a040-9fdbb7941c44-master.m3u8https://video.joostrekveld.net/videos/embed/a8sV92Pf2BsNkfqc2YbzRz58012026-09-02T17:40:21.577ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/4MPzZJhoHEWH3euT4kSWxghttps://video.joostrekveld.net/lazy-static/thumbnails/fb39cbdb-a1b6-4cb2-843d-f5c5c886a854.jpgFG504 test 2Rough edit of exploratory analog HD videosynthesis experiments from 2017 using several Tektronix FG504 signal generators.https://video.joostrekveld.net/static/streaming-playlists/hls/1eb1362c-e0d9-4eb6-a4f7-77236295bb4d/c75c4b2d-0079-46a9-932d-ac8cee09abf5-master.m3u8https://video.joostrekveld.net/videos/embed/4MPzZJhoHEWH3euT4kSWxg143002026-09-02T17:42:15.485ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/4wZ7YfeRVs2JcCw3G4MaN5https://video.joostrekveld.net/lazy-static/thumbnails/3c41b00d-e39c-494d-b468-ce13d0d7a973.jpgFG504 test 1Short fragment of early exploratory analog HD videosynthesis experiments from 2017 using several Tektronix FG504 signal generators.https://video.joostrekveld.net/static/streaming-playlists/hls/1c9eee3e-0c81-4ee9-94e9-d549cb539b6c/46b974cc-257e-43df-8baa-33bde8174489-master.m3u8https://video.joostrekveld.net/videos/embed/4wZ7YfeRVs2JcCw3G4MaN532022026-09-02T17:44:44.666ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/pg4rPHxnyWaGE62GMrjp1Rhttps://video.joostrekveld.net/lazy-static/thumbnails/ee0888f7-3801-4371-a85f-67af2023ee06.jpgBelousov-Zhabotinsky at KASKPlaying around with the Belousov-Zhabotinsky reaction at the [Laboratorium](https://laboratorium.bio/) at KASK in Ghent, with many thanks to María Boto Ordoñez.https://video.joostrekveld.net/static/streaming-playlists/hls/bc5c780b-3a09-43f7-a520-fb5d1409266d/81c08782-fe5e-4430-a9f8-bfdc4c36a63d-master.m3u8https://video.joostrekveld.net/videos/embed/pg4rPHxnyWaGE62GMrjp1R27022026-09-02T17:49:56.248ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/gLrcauPRhP7PSynxjUfFEZhttps://video.joostrekveld.net/lazy-static/thumbnails/9c362acb-5154-4ffa-8cd8-bf9aa9136857.jpganalog Rutt-Etra test 4Exploratory experiments from 2016 with an analog Rutt-Etra-inspired scan-processing setup. Leading up to my video [#67](https://www.joostrekveld.net/wp/?p=1931).https://video.joostrekveld.net/static/streaming-playlists/hls/7fad54c9-464f-408d-bd65-ba525cf6f241/926805ae-e614-4c74-ab25-6b7f88b55383-master.m3u8https://video.joostrekveld.net/videos/embed/gLrcauPRhP7PSynxjUfFEZ80032026-09-02T17:54:50.630ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/rpMjYEhP2jXMPRepMeLdzwhttps://video.joostrekveld.net/lazy-static/thumbnails/944fb200-806c-41e7-8cd1-0a9aae398673.jpganalog Rutt-Etra test 3Exploratory experiments from 2016 with an analog Rutt-Etra-inspired scan-processing setup. Leading up to my video [#67](https://www.joostrekveld.net/wp/?p=1931).https://video.joostrekveld.net/static/streaming-playlists/hls/cdc681d0-1cc1-4128-a65b-6a26cf7c1658/8253afde-f463-47e1-a976-20b6b9d0c859-master.m3u8https://video.joostrekveld.net/videos/embed/rpMjYEhP2jXMPRepMeLdzw130012026-09-02T19:11:21.665ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/vVZURNFL3iciKACBc2ZCqHhttps://video.joostrekveld.net/lazy-static/thumbnails/d69e9d75-4f04-48d2-9892-d8ba1c58e751.jpganalog Rutt-Etra test 2Exploratory experiments from 2016 with an analog Rutt-Etra-inspired scan-processing setup. Leading up to my video [#67](https://www.joostrekveld.net/wp/?p=1931).https://video.joostrekveld.net/static/streaming-playlists/hls/f263214d-ace8-4ef5-b9fa-15ec29e90d41/d1e899d7-e4bb-47e0-8def-d42a45525c6d-master.m3u8https://video.joostrekveld.net/videos/embed/vVZURNFL3iciKACBc2ZCqH142002026-09-02T19:13:21.202ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/i2Fk27EBGL25mksuzLb858https://video.joostrekveld.net/lazy-static/thumbnails/7882a0a4-de1f-4ada-8d2c-492aec7c7b38.jpganalog Rutt-Etra test 1Exploratory experiments from 2016 with an analog Rutt-Etra-inspired scan-processing setup. Leading up to my video [#67](https://www.joostrekveld.net/wp/?p=1931).https://video.joostrekveld.net/static/streaming-playlists/hls/89e75672-35be-4d6c-8250-03191725fddb/50700530-89bf-4b51-b959-b91bd4817a0b-master.m3u8https://video.joostrekveld.net/videos/embed/i2Fk27EBGL25mksuzLb858128002026-09-02T19:16:16.018ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/bW41rx9NFsPmGVsfu9Sm91https://video.joostrekveld.net/lazy-static/thumbnails/ce8777ad-4bdc-4c10-84fe-dbc8d30efda3.jpgstigmergy testEarly tests done in 2015 of a stigmergy-inspired system of particles on the GPU. This led to an installation called #61, and also gave rise to many live visuals performances.https://video.joostrekveld.net/static/streaming-playlists/hls/58876757-2bb8-4fe6-ba51-0c6f50f79ff0/6df49c8b-57e4-43a4-83a6-2ea003e017fe-master.m3u8https://video.joostrekveld.net/videos/embed/bW41rx9NFsPmGVsfu9Sm9151032026-09-02T19:18:49.870ZexperimentsYESjoostrekveldNOhttps://video.joostrekveld.net/w/h9Bv184g6N1LnYs7E6GHDmhttps://video.joostrekveld.net/lazy-static/thumbnails/757a9e82-a11c-4d6e-ae44-6eeceab79c14.jpg#47 - fragment of electrostatic walk in Hortus Botanicus LeidenIn 2014 I made an installation that was exhibited in four cultural institutions in Leiden. The installation constisted of four stereoscopic video viewers, each containing a visualization of the data picked up by an electrostatic sensor during a walk in and around the location in question. This is a (monoscopic) fragment of one of the visualizations that were part of the project. More information can be found [here](https://www.joostrekveld.net/?p=1306).https://video.joostrekveld.net/static/streaming-playlists/hls/82c60be0-818e-4fe7-a66a-2bb0b65b710a/d21fa07c-279e-45e8-87e0-2588364b44ff-master.m3u8https://video.joostrekveld.net/videos/embed/h9Bv184g6N1LnYs7E6GHDm101002026-09-02T19:26:31.476ZinstallationsYESjoostrekveldNOhttps://video.joostrekveld.net/c/joostrekveld/videoshttps://video.joostrekveld.net/a/joost/video-channels