Clive Gifford’s book Eye Benders: The Science of Seeing and Believing has just been crowned winner of the Royal Society Young People’s book prize, which is judged by young people. Here Clive shares some his favourite optical illusions from the book
Shifting Cube: a Visual Illusion. There are two cubes: a small one and a big one. Or is it just a small cube set up in a corner formed by three planes? Or, perhaps, it's a big cube one of whose corners was cut off?