Triangle Puzzle (Curry’s Paradox)
What to see
Observe the triangle on the right. It consists of 4 coloured pieces, and a missing
square. Now press the “re-order pieces” button. Three
pieces move to another place, the overall shape seems the same, but the square is
no longer missing!
What to do
Repeat the re-arrangement of the pieces and have a go at the puzzle. Where is the
missing square? What happens here? Be assured that this is no computer trick, it
would work just as well with pieces cut from cardboard. In fact, it’s great fun
to do so and make a nice puzzle for your dear one(s).
Comments
1、Should I really tell you the solution? You probably have figured it out by now.
Hint: it does belong into this optical illusion collection, and there’s a good reason
it’s sitting in the “Geometric- & Angle Illusions” category.
2、Martin Gardner popularised this in Scientific American, the original inventor
seems to be Paul Curry, a New Yorkean magician.
Sources
Martin Gardner (1965) Mathematics, Magic and Mystery, New York, Dover Publ.
Good explanation at
Grand Illusions
Geometrical Paradoxes
Here’s the
solution.
Created: 2008-02-12
Last update: 2013-10-04