A kinetics-related product based on the spirit of “Tai-Chi” that incorporates the principles of harmony, symmetry and continuous circulation to promote a heightened sense of motion and space. Two hands hold the outer ball to control the motion of the inner ball on a track, thus improving the user’s dexterity and hand-eye coordination. The high-quality, clear polycarbonate material of this “ball in a ball” is fun and visually arresting. The track inside the ball imitates ancient Chinese culture, in which a curving line symbolized continuous circulation and vitality. The Tai-Chi Ball is an exciting toy for ages 4 to 99.