Star Tile with Griffins, Birds and Leaves

Perhaps the most important contribution of Muslim potters, the application of luster to a ceramic surface was not limited to vessels. As early as the ninth century, this costly technique was applied to wall tiles to distinguish parts of buildings. In the eastern Islamic lands during the medieval era, the use of colored tiles — decorated with luster but with other techniques as well — increased in complexity and scope. In both religious and secular buildings, large surface areas came to be sheathed in brilliant ceramic revetments. Although the star tiles bear self-contained designs, they were intended to interlock with cruciform tiles in a grid.