Few mathematicians have never meditated on Maurits Escher’s magnificent “Waterfall”. This print convincingly depicts an over and undershot waterwheel perpetually driven by a closed stream. The water flows from the base of the wheel down a zigzag millrace which is supported by two towers, and spills from it again, two stories above the wheel.
KeywordsFundamental Group Euclidean Geometry Free Abelian Group Holonomy Group Picture Plane
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