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What brain info does the road sign give

Submitted by Anonymous (guest) on Wed, 09/17/2008 - 11:43am.

I seem to see two dots moving up and down, or two arrows moving up and down. Pointing the arrows clockwise or counterclockwise makes no difference, though I can see why it might. Is there any psychological lesson in this, any insight? If not, what's the point?

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