Double Dovetail Puzzle, Optical Illusion or Real Creation?

The below item is composed of two solid pieces of wood. There are no holes in this block. If you grab the top piece and lift the bottom comes with it.
Cool Illusion Picture - Double Dovetail Puzzle


Amos presented the bottom picture with the following statement:
A craftsman took two solid pieces of wood, and carved them so they could be put together in the form illustrated below (the slight overhang is only used to illustrate the two parts). Each part is solid, and cannot be separated. The whole block is solid and has no spaces inside. The full cube could be lifted by picking up the top half.

How was this cube created (no adhesive used)?

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