Muqarnas (Arabic: مقرنص; Persian: مقرنس) is a form of ornamented vaulting in Islamic architecture, the “geometric subdivision of a squinch, or cupola, or corbel, into a large number of miniature squinches, producing a sort of cellular structure”, sometimes also called a “honeycomb” vault. It is used for domes, and especially half-domes in entrances, iwans and apses, mostly in traditional Persian architecture. Where some elements project downwards, the style may be called mocárabe; these are reminiscent of stalactites, and are sometimes called “stalactite vaults”. Muqarnas developed around the middle of the 10th century in northeastern Iran and almost simultaneously — but apparently independently — in North Africa. Examples can be found across Morocco and by extension, the Alhambra in Granada, Spain, the Abbasid Palace in Baghdad, Iraq, and the mausoleum of Sultan Qaitbay, Cairo, Egypt. Large rectangular roofs in wood with muqarnas-style decoration adorn the 12th century Cappella Palatina in Palermo,…