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Puzzle crafting & workshops • Laboratorio di giochi d'ingegno • Atelier de puzzles
by Gianni A. Sarcone & Marie-Jo Waeber
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Tetrahedron marble top

This incredible marble top, when spun on its base as shown below (fig. A), will tip itself over automatically and continue spinning on its "stem" (fig. B) -- a behaviour caused by sliding friction effects with the ground.

How to make a tetrahedron marble top
Take 4 standard marbles and glue them together with a strong quick-setting glue by assembling them into a two layer tetrahedron (kind of pyramid, as illustrated below). It's all.

spinning tetrahedron
© www.archimedes-lab.org
Source: Tetratops

How to spin your tetrahedron marble top
Grap one marble between your thumb and forefinger and... spin!

 

 

 grab the top

 

 
spinning marble top
 

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Archimedes journal ARCHIMEDES journal is an interactive review devoted to entertaining & involving the readers with puzzles, recreational mathematics and visual creativity. This journal is published for an audience without a specific math background. Each issue covers a broad range of mental and hands-on activities for the reader to enjoy! Workshop image "How to focus attention? Encourage creative exploration?" Multicultural interactive puzzle activities & workshops for museums and institutions.
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