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Alhambra palace angles birds show black birds bound by rules buildings checkerboard colors complex irregular tessellation created creatures Day and Night decorated drawing paper equilateral triangles Escher once examples of tessellations experimenting with tessellations extended infinitely fit snugly fit together perfectly flipped form a regular Four squares fourteenth century gaps or overlapping geometric shapes height honeycomb Islamic kind of art leave gaps Liberation lizards ln fact look lslam lslamic art M.C. Escher math mathematical mathematicians mirror image mosque Muslim Netherlands Notice Optical Art Optical Artist ornate overlap or leave picture pieces puzzle regular hexagon regular octagon regular polygons regular tessellation repeated Reptiles resemble a regular saw earlier self-portrait semiregular tessellations set of birds shape formed shapes fit shown sides SlH-muh-tree Sun and Moon symmetrical patterns symmetry transformation tessellated pattern tessellations are called three-dimensional tile surfaces tile the plane two-dimensional unusual vertex add visual effects walls white birds width