Catholic postures and gestures such as bowing the head, striking the breast, kneeling, and making the sign of the cross are meant to direct worshippers from mundane concerns toward the sacred. Specific gestures are associated with different parts of the Mass as well as expressions of sorrow, humility, and reverence toward religious icons and clergy. Prostrations involve lying flat on the ground in a posture of total humility before God or a crucifix.