Hoberman Sphere (Octahedron)

number of rings

1

2

lift

2

scissors

4

8

12

16

20

diameter of pivot

0.12

diameter of nodes

0.1

large format

Expandable flat rings made of scissors are placed on a sphere's great circles that lie along the edges of an invisible octahedron. The number of scissors in a ring must be divisible by four. The geometry of this assembly corresponds to that of a Hoberman sphere.