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Interlocking 20-Ball Tetrahedron1

Interlocking 20-Ball Tetrahedron1 Design and Copyright : George Bell (2009).

A5/15 B5/15 
 . .|O .
O . | . .
 O O|. .
. O | . .
C5/30 D5/30 
 O .|. .
O . | . .
 O .|. .
. O | . O
Pieces 4 Flexible slightly. A-B, C-D are congruent.
Selection mirror pair
Solutions 1 / 1 Rotation required.
Jul 19, 2009 by k16@chiba.email.ne.jp