The bold patterns, usually in red, blue, and white, are highly varied. Several designs, showing rows of panels or central medallion designs, preserve the fashions of much earlier centuries. Large central diamond designs, for example, are derived from a wreath motif seen in Ottoman court prayer rugs (prayer rug) of the 17th century. The format of Bergama carpets is usually more nearly square than in other Turkish types, and the few known prayer rugs tend to be unusually small. The red dye used in this area sometimes causes the pile to erode and look as if it had been cut in relief.