Does someone knows the name of this packing puzzle, or its inventor?
The goal is to repack the shapes into the square with the additional red square.
It is an easy puzzle but the construction is interesting.
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The puzzle is called "Magic Square (Philos)", by the Dutch-Italian game designer Niek Neuwahl.
Also, Creative Crafthouse (and possibly others) has it under the name "The Impossible No Fit Puzzle." or "No Fit" puzzle.