Exercise ball a chair because of ergonomic considerations or biomechanical reasons. This large plastic ball, known as a "birth ball", can also be used during labour to aid the descent of the fetal head into the pelvis. Sitting in an upright position will also aid fetal positioning and is more comfortable for the woman. Sitting on the ball with arms placed on a bed, table or otherwise sturdy object for support and gently rocking the hips may help the woman during contractions and aid the natural physiological process of birth. Exercise ball An exercise ball, also known as a Swiss Ball, is
Scioptic ball used simply as light sources. It was an early example of a type of wide-angle lens. Daniel Schwenter (1585-1636), professor of mathematics and oriental languages, developed the scioptic ball in 1636. In 1685, Johann Zahn illustrated a large workshop camera obscura for solar observations using the telescope and scioptic ball. Scioptic ball The scioptic ball is a universal joint allowing an optical instrument mounted on a ball to be swiveled to point anywhere in a wide arc. It was inspired by studies of the human eye. It has a number of applications. The scioptic ball may provide a firm anchor