Perpetual Puzzle by Tenyo
A rectangular puzzle fits perfectly inside of a frame. The magician adds
a new piece and rebuilds the puzzle, yet somehow they still form a
rectangle that is exactly the same size, a Perpetual Puzzle. The
puzzle still fits perfectly in the frame. When you add another piece and
rebuild the puzzle again, the puzzle impossibly still forms the same
exact size rectangle, and fits perfectly within the same frame.
This
magical puzzle is a masterpiece of ingenuity. The more you add, the
more things remain the same. While your audience may surmise that the
rearrangement of pieces enables this baffling puzzle to work, they will
never suspect that the frame and cardboard also contain subtle gimmicks.
It is this disarming combination that allows you to perform a truly
impossible illusion.