Straight pool
In the first rack in straight pool (when you place all the balls together before the break), the fifteen object balls (the colored balls) are racked in a triangular frame, usually made from aluminum, wood, or plastic. The center of the ball at the top of the rack is placed over the a spot on the table called the foot spot.  Traditionally, the 1 ball is placed at the rack's right corner, and the 5 ball is placed at the rack's left corner. Other balls are placed randomly. All the balls must touch their neighbors. However, it is considered a courtesy by some players to place a striped ball at the front of the rack. This is because the break is very important and it is believed that a striped ball is easier to hit very precisely.