It's got that fun about it; it's playing a game against Nature.
Richard Gregory is Professor of Neuropsychology at the University of Bristol. Among his personal scientific armoury he numbers puzzles, gadgets, o puns and visual illusions.
In conversation with Lewis Wolpert of the Middlesex g Hospital Medical School, t London, he reflects on his somewhat unconventional attempts to catch out the cunning mechanisms of the mind.
Producer ALISON Richards