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They now work on preserving many of these works, which often require CRTs and other now-vintage hardware.
CTL's newsletter and other publications from that era, like Radical Software and Guerrilla Television, have a 2600-style mix of tech advice and social theory. Nam June Paik contributed to many of them.
If you ever go to a museum and there is Nam June Paik exhibit on display, see if you can see the back. There are often interesting tidbits in the wiring and even sticky notes from him about how to set up and troubleshoot the art.
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All you had to do was be an avid sci-fi reader.
In fact, a lot of the world we take for granted today was predicted by sci-fi authors. Speculative fiction is how the horizon gets brought near.
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The realm of generative/interactive/media art is very strong these days, particularly thanks to accessible software like Processing and p5.js.
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https://en.wikipedia.org/wiki/Musique_concrète
(The rest of them seem to be not unreasonable claims though.)