After reading the book, The Living Brain by Dr. Grey Walter, Ian Sommerville invented the Dream machine. He produced it in the 1960's, in order to replicate the flickering effect. The machine consisted of a cylinder with holes in it attached to a record table, with a light bulb in the middle. When the record table was turned on it would create the flickering effect that Sommerville had learned about. It is called the dream machine because when viewing the cylinder with your eyes closed and lights off, it creates alpha wave cycles, which are a sign of relaxed activity in the brain.
Dreamachine: Dreamachine
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