Ka'ba
"The cube," a gray stone structure at Mecca; re-shrouded annually in black brocade. It marks the geographical center of the Islamic world and is the focal point of prayer, orientation, and pilgrimage. It is viewed in Muslim tradition as the first "house of God" built by Abraham and his son Ishmael at God's command.
The first main ritual is Circling (tawaf) the Ka'ba seven time counterclockwise, putting the house of God, center of the universe, at center of one’s life.