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Four tops, the three shapes above and a cuboctahedron come packed in a see-through plastic tube with a set of trading cards explaining the details of each shape in terms of faces, vertexes, etc. . Przybilla wanted a three dimensional model of some of the building-block shapes Mr. Fuller talks about, like the icosahedron, the octahedron and the tetrahedron. He built them from plastic spheres and while fiddling with the models realized that they could be spun.
The more spheres in the shape, the more axes of spin. There are many shapes including the tetrahedron, octahedron, icosahedron and cuboctahedron that came with the set I purchased. The man responsible for turning the spherical into the playable is Kurt Przybilla. An obsession with the science of spheres and their applications in the real world, Przybilla discovered their value as playthings. He started Omnidrectional Ideas and set out enlighten us all about the spherical.
. p a g e 11 Mad About Design patent 5,996,998 A few years ago a 35-year-old English teacher in New York wandered around New York's Chinatown and stumbled upon some small acrylic balls at a store called Industrial Plastics. Influenced by a childhood fascination with a geodesic jungle gym in his family's back yard and inspired by a lifelong fascination with Buckminster Fuller, the architect and futuristic thinker who invented the geodesic dome, Kurt Przybilla glued the balls together into different configurations and set them on his desk. One day he picked up one of his models and set it spinning. Though it had no pointed edge, it twirled like a top.
. p a g e 11 Mad About Design patent 5,996,998 A few years ago a 35-year-old English teacher in New York wandered around New York's Chinatown and stumbled upon some small acrylic balls at a store called Industrial Plastics. Influenced by a childhood fascination with a geodesic jungle gym in his family's back yard and inspired by a lifelong fascination with Buckminster Fuller, the architect and futuristic thinker who invented the geodesic dome, Kurt Przybilla glued the balls together into different configurations and set them on his desk. One day he picked up one of his models and set it spinning. Though it had no pointed edge, it twirled like a top.

another przybilla site: http://www.socool.com/yo-yo/faq.html

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