Ring of Tetrahedrons  
Home > Geometric toy > Ring of Tetrahedrons 
Let the vertices of a cube be A,B and two points on edges be C,D.Where triangle ABC,ABD are halves of equilateral triangle. Make a tetrahedron ABCD. As in the same way let make 6 tetrahedrons. 



Next,let hinge six tetrahedrons as a ring. This ring can transfrom in freedom of movement 1. (Paul Schatz 1928) 



Make one tetrahedron with 4 abovementioned tetrahedrons.You can make another "ring of tetrahedron" with them. Photo is a "Kaleido Cycle",construceted by the book"M.C.ESCHER KALEIDOCYCLES"by Doris Schattschneider and Wallace Walker. Real animation of Kaleido Cycle(178KB) 


This is same mechanism as stated above but made of metal pipes and wires.  
Sold as "Geometry", "Hexyflex", "FlexiStar3" etc. 

simple closed loop  
Made of long nats and long balts. It turns smoothly and windingly. made by Akira Nishihara 

serrureries1  
made of 6 Lshaped serrureries made by Akira Nishihara 

serrureries2  
made of 6 twisted metal rectangles made by Akira Nishihara 

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