The Grey Labyrinth is a collection of puzzles, riddles, mind games, paradoxes and other intellectually challenging diversions. Related topics: puzzle games, logic puzzles, lateral thinking puzzles, philosophy, mind benders, brain teasers, word problems, conundrums, 3d puzzles, spatial reasoning, intelligence tests, mathematical diversions, paradoxes, physics problems, reasoning, math, science.

   

Strange Squares

8x8 Square

Here's a classic mystery that I learned when I was young. I still think it's pretty neat.

To the right is an square measuring 8x8, or 64 little squares. Draw this square on a piece of graph paper and cut it along the blue lines shown. Then rearrange the square to form a rectangle like the one below.

There, wasn't that easy?

Wait, something's wrong... the rectangle measures 5x13, which is 65 little squares, not 64. Where did the extra square come from?

5x13 Rectangle


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