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September 6, 2002
Q. What does it take for the world to disappear before your eyes? Think optics, eyeball jiggle, and Jurassic Park.
A. Start with the flip-flop optics of your eyes' lenses actually painting the world upside down on your retinas. To compensate for this inversion, your body's map on your brain is also upside down -- keeps the map in synch with visual space -- says State University of New York neurosurgeon James Holsapple. "In this sense, your brain is hanging by its toes in your cranium!"
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