The Boston Globe kindly shows us how to hallucinate using ping pong balls and a radio, as well as other fun perceptual tricks. How to hallucinate with ping-pong balls and a radio
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. Come and hear Mark speak at the ALA conference in Chicago on July 1.