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These three identical pieces can be interlocked to form a 4x4x4 cube either in 6 sequential steps or smooth coordinate motion. This original puzzle has a beautiful rotational symmetry and is not trivial to solve.
Based on inspiration from Robert Reid's cubic trisections, Tom Jolly's Tangler Puzzle and help from Bram Cohen.
If you would like to get a tri-colour version like the one in the picture, you will need to order three individual copies of "Triaxial piece (2cm)" and specify a different material for each piece.