Chapter 1. The route to regular division -- Early signs ; The fascination of regular division of the plane ; An important journey ; The open gate ; The geometric rules ; Developing a "layman's theory" ; Sources that came too late ; Other experiments in regular division -- Chapter 2. The 1941-1942 notebooks -- The 1941-1942 notebooks ; Escher's theory in relation to mathematical and crystallographic classificiation ; Escher and the scientists on contrast and color -- Chapter 3. The regular division drawings -- From theory to the periodic drawings ; The folio notebooks of periodic drawings -- Chapter 4. The use of regular division -- The periodic drawings as sources ; Capturing infinity ; Metaphor and metamorphosis ; Escher's decorative use of regular division of the plane ; The use of Escher's work on regular division by others -- Chapter 5. Notes on the drawings.
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