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.


The Marbles

You are taking care of your friend's prized marble collection while he's at a marble collector's conference. You notice that his cleaning lady has disturbed one of his displays, shown below, not in its normal layout. The note beside the display says "five straight lines, each of exactly four marbles."

Right now you see two lines, each of exactly five marbles. Could they have been arranged as described, or has your friend lost his marbles?

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