Seasonal Arts and Crafts for Kids: Holiday Crafts and Special Days
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M.C. Escher (1898-1972) was a Dutch illustrator known for his optical illusions, tessellated repeating patterns, and intricately detailed black-and-white images illustrating mathematical principals.
First thing you'll probably notice, is that this site is in Dutch.
Named after the image on a box of Droste brand chocolate, the Drost effect is a Dutch term for a recursive image that includes a picture of itself.
Among his [Escher's] greatest admirers were mathematicians, who recognized in his work an extraordinary visualization of mathematical principles.