Imaginary Cube Puzzle 3H=6T Is

What is Imaginary Cube Puzzle 3H=6T ?

 

Imaginary Cube Puzzle 3H=6T has two kinds of polyhedral pieces.
One is a hexagonal bipyramid imaginary cube, which we call “H”.
And the other is a triangular antiprismoid imaginary cube, which we call “T”.

Each piece fits in a small cubic box, and all of them fits in a large box. 

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