WEBVTT

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We use a lot of information to judge how big an object is.

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One way is by comparing one object to another.

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If an object  is next to something large, it looks smaller, like the circle on the right.

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If an object is next to something smaller than itself, it looks larger.

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Thus, the surrounding circles serve as comparisons, and change the perceived sizes of the two center circles.

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The take home message is if you want to look taller, stand next to someone shorter.