M.C.Escher 10
His last tessellation was a solution to a puzzle sent to him by Roger Penrose, the mathematician. Escher solved it and, true to form, changed the angular wood blocks into rounded 'ghosts'.
Escher died in a home for old artists on 27th March, 1972. He had produced 448 woodcuts, linocuts and lithos and over 2000 drawings.
See more examples of his work in 'Galleries - Escher'.