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
Castle of Santa Catalina (Jaén) Castle of Santa Catalina (Jaén) Saint Catalina's Castle (Castillo de Santa Catalina) is a castle that sits on the Cerro de Santa Catalina overlooking the Spanish city of Jaén. It is now the site of a parador. The castle began as an 8th Century Moorish fortress last improved by the Nasrid King Abdallah ibn al-Ahmar, who also built the Alhambra. Earlier, where the parador now stands, there was a tower known as Hannibal's Tower, of which some traces remain. After King Ferdinand III of Castile captured the city in 1246 after the Siege of Jaén, he commenced a transformation of