Kirsty Young's castaway this week is the mathematician Marcus du Sautoy.

A professor of mathematics at Oxford University and a fellow of New College, he has recently been named as the next Simonyi Professor for the Public Understanding of Science. He has always been driven to try to demystify and popularise his field. It's clearly a task he takes seriously - his father has recently enrolled on an Open University course in maths and, he admits, when he took his young son to visit the Alhambra in Spain, he challenged him to find the 17 forms of plane symmetry in the palace.

[Taken from the original programme material for this archive edition of Desert Island Discs]

Favourite track: The Prelude to Parsifal by Richard Wagner