How to hallucinate with ping pong balls

Tape one half of a ping pong ball over each of your eyes, sit under red-gel lamps and listen to white noise – and then prepare to enter a very surreal world.

Did you know ping-pong balls can cause you to hallucinate?

Neither did BBC Future.

But a funny thing happens when you cut one in half, sit under red-gel lamps and don earphones playing white noise. Something very funny indeed…

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This video was inspired by the book Unthinkable: An extraordinary journey through the world's strangest brains, by Helen Thomson.  

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