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>> The colours appear to be a simple overlay, but how the hell did they
>> produce those complex patterns?
>
> Complex? Looks like a simple video feedback effect to me:
Wikipedia also claims that it's video feedback. However, it is beyond my
powers of comprehension how you'd make patterns like this with video
feedback.
Video feedback produces trivial zooms or spirals. For example, the part
where Pertwee's face materialises - *that* looks like video feedback,
which its simple linear patterns. But the intricate evolving spirals?
The patterns that flow upwards or downards across the screen? The
bubbling effect? No idea.
Similarly, look at the earler BW one:
http://www.youtube.com/watch?v=bKg9tuSbXmk
How on earth did they get those complex organic patterns? Doesn't look
like any kind of linear feedback I know of. (Actually looks more like a
reaction/diffusion system, but that's impossible without a computer.)
> It's kind of like the video version of those synthesizers that were all
> the rage at about the same time.
Hell, when this was made, they didn't even *have* synthesizers! Not
commercial ones, anyway. All the sounds were made by a guy with a room
full of oscilators, tape machines and other equipment. It's kind of
amazing that the resulting sound is so fluid and organic; apparently it
took many, many hours to produce...
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