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Perfect miniature of minimal manipulation: a single visible action, a single true idea and an exact closure.
Six identical glasses are lined up on a table. The first three are full of water and the last three are empty: full, full, full, empty, empty, empty You can only move a glass, and do it only once.
How do you leave them alternating full, empty, full, empty, full, empty?
The initial layout is:
L,L,L,V,V,V If you take the second glass, which is full, and pour its contents into the fifth glass, which is empty, the new arrangement is:
L,V,L,V,L,V and it is already alternating perfectly. You've only moved one glass, and only once.
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