A specific Islamic pattern is the mihrab pattern which defines the Prayer rug. A prayer rug is characterized by a niche at one end, representing the mihrab in every mosque, a directional point to direct the worshipper towards Mecca. The mihrab pattern in Turkish carpets is often modified and may consist of a single, double, or vertically or horizontally multiplied niche. Thus the niche pattern can range from a concrete, architectural to a more ornamental understanding of the design. Prayer rugs are often woven "upside down", as becomes apparent when the direction of the pile is felt by touching the carpet. This has both technical (the weaver can focus on the more complicated niche design first), and practical reasons (the pile inclines in the direction of the worshipper's prostration).