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 domination of parts of western Europe for more than seven centuries. It is therefore of historic significance not only for Gibraltar and Iberia, but also for all of western Europe. The present Tower of Homage, and most of what is visible today of the Castle, was rebuilt during the second Moorish period of occupation in the early 14th century, after its near destruction during a reconquest of Gibraltar by the Moors following a re-occupation by Spanish forces from 1309 to 1333. Today the Moorish Castle is one of the major tourist attractions of Gibraltar, and it is shown on the