- Escher’s work refuses to be pigeonholed. Scientific, psychological, or aesthetic criteria alone cannot do it justice. The questions remain: Why did he create the pictures? How did he construct them? What preliminary studies were necessary before achieving the final version? And how are his various creations interrelated? This book, complete with biographical data, 250 illustrations, and a thorough breaking-down of each mathematical problem, offers answers to these and many other lingering mysteries, and is an authentic source text of the first order.