M.C.Escher, Maurits Cornelis Escher (1898 - 1972) was a Dutch artist, known for his woodcuts, wood engravings and lithographs, in which he often played with mathematical principles. He signed his work with MCE.
His engravings often depict impossible structures, studies of infinity and interlocking geometric patterns (divisions) that gradually change into completely different shapes. Escher often used regular tilings of polygons that represented people, animals and other figures through protuberances and indentations. Some well-known representations he drew are designed around impossible objects such as the Penrose staircase. Mathematicians discovered symmetries and themes from their field in his work.
In the heart of The Hague (Netherlands) is the Escher Museum: Escher in the Palace. A very nice museum for young and old.