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You may already be familiar with Maurits Escher's fanciful drawings and beautiful tilings based on the hyperbolic plane, with Angels and Devils being one of the most famous. Fewer people are aware that he preceded this work with highly original investigations into repeating patterns in the more familiar Euclidean plane. Look at some of Escher's amazing patterns, and see how Mathematical Explorer can be used to create in minutes patterns that would take hours or days by hand.