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 Gibraltar the Kingdom of Castile in 1309 after a short siege. Muslim control was restored in 1333 after another, much longer, siege. The city subsequently underwent a major expansion and refortification. A number of buildings and structures from this period still exist, including the Moorish Castle, parts of the Moorish walls, a bath-house and a subterranean reservoir. Gibraltar was subjected to several more sieges before its final fall on 20 August 1462 (feast of St. Bernard) to Christian forces under the 1st Duke of Medina Sidonia. The population, Muslim and Jewish, was expelled "en masse" and replaced by Christian settlers. Gibraltar's