Tessellations frequently appeared in the graphic art of M. C. Escher ; he was inspired by the Moorish use of symmetry in places such as the Alhambra when he visited Spain in 1936. Escher made four " Circle Limit " drawings of tilings that use hyperbolic geometry. For his woodcut "Circle Limit IV" (1960), Escher prepared a pencil and ink study showing the required geometry. Escher explained that "No single component of all the series, which from infinitely far away rise like rockets perpendicularly from the limit and are at last lost in it, ever reaches the boundary line."