At the center of the grand mosque is the Kaaba, which according to Muslim traditions was built by the Prophet Abraham and his son, the Prophet Ishmael. Covered in black cloth, it is circled seven times by Muslim pilgrims and it is toward the Kaaba that Muslims face in the direction while performing Islamic prayers (Salat). The Black Stone set intact into the Kaaba's eastern cornerstone wall by Muhammad himself is an Islamic relic which, according to Muslim tradition, dates back to the time of Adam and Eve. Many Muslim pilgrims while doing Tawaf try to kiss and touch the sacred stone; however, this usually requires a lot of effort because of crowding.