Two congruent open boxes can be combined to form an hollow box.
For the 4x6x6 box with wall thickness 1 the extended tricubes are used.
The 3x5x8 box is constructed with the clipped tetracubes.
The 4x4x8 box is a similar hole box that means the 2x2x4 hole is similar to
the whole box.
The 4x4x4 hollow cubes with 2x2x2 holes are similar hole boxes with a constant wallthickness
Drawings showing the layers of the constructions.
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