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When people think about how to solve a problem, they typically manipulate verbal concepts.

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For example, you solved the candle problem by manipulating the concepts "candle," "match," and "lighting a candle"

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until you arrived at a plan of action: "Move the match to the candle wick."

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But not all thinking depends on verbal concepts.

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A quite different form of thinking involves manipulating mental images--the "pictures in your head"

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that allow you to think about things that can't be expressed easily in words.

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These mental images can be moved and rotated “in your head” to solve problems and make decisions.

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 The amount of time required to rotate an object “in your head” increases predictably

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as the amount of rotation (angular distance) increases, just as it would if you were rotating the actual object in your hand.