The furnishings of Cairo’s mosques, especially during the Mamluk period, were decorated with intricately constructed polygons and strapwork. Most often, the polygons were of wood, either carved or inlaid with ivory or colored woods. In this particular door (Wood (rosewood and mulberry) it was made of copper / bronze . These doors exhibit a great variety of patterns, most of which are also found in other media, such as stone carvings, marble mosaics, and stucco window grilles. The accurate cutting required to make such patterned objects is remarkable, since every piece affects the whole.
Zoom in -please – see the missing piece and look how each piece was perfectly nailed in the wood to make the forms. Just recessing the door few inches adds to its beauty.