The Dutch graphic artist M.C. Escher (1898-1972) is known and loved worldwide for his plane-filling patterns and prints of buildings that are optical illusions. Eschers graphic work made him internationally famous but few people know about the influence of Islamic art on his work. His fascination with it began during two visits to Southern Spain in 1922 and 1936. This book demonstrates how the graphic artist transformed the geometric patterns of Islamic art into his renowned mathematical art.