Robert Neale's Magic Ball

Robert Neale's Magic Ball is classified as action origami because it features kinetic movement—the model can be collapsed completely flat and then expanded back into a three-dimensional sphere by manipulating its structure. This interactivity distinguishes it from static display models and makes it a perennial favorite at origami conventions.

The Magic Ball uses a tessellated pattern of alternating mountain and valley folds that create a flexible grid, allowing the entire structure to compress flat and then spring back into a spherical shape. When pressure is applied to the top and bottom, the folds collapse inward; releasing the pressure allows the ball to re-expand.

Robert Neale is an American origami artist, scholar, and former professor known for his innovative action models and his interest in the mathematical and philosophical aspects of paper folding. His Magic Ball is one of his most widely shared designs, frequently appearing in origami convention books and instructional collections.

The Magic Ball benefits from paper that is thin enough to fold many layers precisely but sturdy enough to hold the expanding structure, such as standard kami or slightly heavier origami paper. Some folders use foil-backed paper for added rigidity, which helps the ball maintain its spherical shape when expanded.