Original Hoberman Sphere

Watch one structure triple its size in a single motion

The Original Hoberman Sphere is built from interlocking scissor-like struts that pivot at every joint. Pull the poles apart and the entire structure expands evenly in every direction at once, growing from about 9.5" to 30" in diameter in one continuous motion, then collapses back down just as smoothly.

There's no motor and nothing to calibrate; the expansion comes entirely from the geometry of the linked struts, an angulated scissor mechanism, the same mechanical principle used in real deployable structures like retractable stadium roofs and folding satellite booms. It's lightweight plastic, built to handle constant expanding and collapsing without struts binding or popping loose.

Works across a wide range: a satisfying motor-skill and focus tool for younger students, and a structural engineering demonstration of uniform scaling and transformable linkages for older ones.

Why Teachers Love It

• One Motion, Uniform Expansion – A single pull scales the whole structure evenly in every direction, not a lopsided stretch in one direction.

• Real Engineering Principle, Not Just a Toy – Demonstrates the same angulated-strut scissor mechanism used in real deployable structures, from retractable roofs to foldable space hardware.

• Works Across Every Grade Level – A hands-on sensory and motor-skill tool for younger students, a structural engineering demo for older ones, same object either way.