I've sometimes wondered if you could do that with a couple of EyeToys.
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Thu 19 Feb 2009, 0:16,
archived)
Can do it with a webcam or video camera with monitor
So don't see why not.
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Thu 19 Feb 2009, 0:17,
archived)
It gets darker with each recurring image though
However from this I can conclude infinity is black.
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Thu 19 Feb 2009, 0:19,
archived)