I thought others might be interested in this intriguing example of early AVS technology ( albeit used in a more entertaining rather than entraining way). The light source is clearly some kind of high voltage strobe device. Certainly makes you appreciate the compactness of modern AVS gear
The whole film on YouTube is in three parts
Go straight to 4min 55sec into the linked clip to see the AVS machine .
The film is called The Sacred Mushroom made in 1961 and was about a group of researchers investigating the reported ESP enduced by mushrooms in a remote community headed by Mexican "brujos" (witches).
http://www.youtube.com/watch?v=t3NMqCij7cI
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