Regular Division of the Plane Regular Division of the Plane Regular Division of the Plane is a series of drawings by the Dutch artist M. C. Escher which began in 1936. These images are based on the principle of tessellation, irregular shapes or combinations of shapes that interlock completely to cover a surface or plane. The inspiration for these works began in 1936 with a visit to the Alhambra, a fourteenth-century Moorish castle near Granada, Spain. Escher had visited the Alhambra once before in 1922 but in this visit he had spent several days studying and sketching the ornate tile designs there. In 1958 Escher
Moorish Castle reverse of the 1995 design (still in circulation) of the Gibraltar five-pound banknote. The name "Moorish Castle" (or ""El Castillo"" in Spanish) is also used locally when referring to the residential area surrounding the Castle, location of the "Moorish Castle Estate". Part of the castle itself housed the prison of Gibraltar until the prison was relocated in 2010. Moorish Castle The Moorish Castle is the name given to a medieval fortification in Gibraltar comprising various buildings, gates, and fortified walls, with the dominant features being the Tower of Homage and the Gate House. Part of the castle itself also housed