Missing Square Puzzle

New York magician Paul Curry invented this puzzle in 1953. When the pieces of the triangle are rearranged as shown, suddenly a square is missing. How is this possible?
(Answer)
(Image: Wikimedia Commons)

New York magician Paul Curry invented this puzzle in 1953. When the pieces of the triangle are rearranged as shown, suddenly a square is missing. How is this possible?
(Answer)
(Image: Wikimedia Commons)