This may refer either to actual or implied movement, or to an angle or a point of view. Demonstrating how much we take direction for granted, some of the following examples depict places where up and down ? fundamental directions upon which we orient ourselves to the world ? are impossible to determine consistently:Maurits Cornelis Escher (Dutch, 1898-1972), Gallery, 1946 (1st state), till 1949 (further states), mezzotint, 4th state. See a colorful variation on this image, called Other World, 1947, wood engraving and woodcut in black, reddish brown, printed from 3 blocks. See optical illusion and state.Maurits Cornelis Escher, Up and Down, 1947, lithograph in brown.A. Prieto (Cuban), designer, Comisi?n de Orientaci?n Revolucionaria, publisher, Todos a la Plaza . . . (All to the square, July 26

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