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Finally, "Depth."
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You see this and you don't--
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You see it on one level as a flat thing.
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Another level you look inside the picture and you see,
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for instance, the man is in front of the house.
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You look at me and you see the podium.
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And if you have a terrible neurological disorder
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you see this strange creature
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that's half podium leading on to a chest and up to a head
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that's sort of-- the top of him is wiggling
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and the podium staying still.
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If you are neurologically normal,