Abstract: An apparatus for demonstrating how golf balls interact with golf clubs includes a downswing plane, a club shaft attached to the downswing plane, a golf club head attached to the club shaft, and a collision-plane indicator attached to the golf club head wherein the collision-plane indicator illustrates the plane created by two intersecting lines that are in the direction of the path and the direction of the club face. Preferably, the downswing plane has an adjustable angle, and preferably the downswing plane swivels. Preferably the club shaft is pivotally attached to the downswing plane. Preferably the apparatus includes a removable golf ball with a spin axis through the middle of the ball, and with a black line across the middle of the ball that indicates spin direction perpendicular to the ball's spin axis.