Summary This puzzle was my entry for the 2011 IPP Puzzle Design competition in Berlin where it was a Jury 1st Prize winner. "Two open-ended Superstrings with the correct spin can be merged into a super-symmetrical cube." The idea for this puzzle emerged when I was designing shapes based on two interlocked tetrahedra. Inspired by ideas from 'string theory' and 'super-symmetry', I began to search for shapes that were both symmetrical and as similar as possible. The two pieces may look similar but they are very slightly different.
The puzzle is in very good condition.
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