The muqarna (honeycomb design) is a decorative feature made with a geometric combination of hanging interlocking prisms, the bottom of which is hollowed out to form a concave shape. It is used to decorate buildings.
Placed within a framework of squares and diamond-shapes the hollowed-out bottom of the modules or prisms is painted in colour, while the top is hidden by one of the faces of an adjacent prism. An important rule in the layout of this decoration is that two adjacent pieces must have their joining lines pointing in the same direction.
The muqarna marked the peak of perfection in the mathematical calculations and geometrical design initiated with the panels of ceramic wall tiling, which in this art-form are stretched into three dimensions. Islamic art used muqarna in a wide range of architectural features such as cornices, arches and capitals, but its most spectacular manifestation was in vaulted ceilings in plaster, such as the one in the picture from the Hall of the Two Sisters in the Palace of the Lions.