Jim Henderson wrote:
> Well, the thing is, even when using just one eye, if your brain has had 
> practice at determining how far away stuff is, even with one eye you 
> adjust and still have depth perception.

Binocular vision really doesn't help much past about 15 or 20 feet. 
After that, it's size and relative velocities.

I read about this (supposedly true) tribe of natives that lived in the 
Amazon jungles forever. When taken out onto the plains, they thought the 
explorers were magicians, because they could make the cows the size of 
flies. Apparently, they'd never learned how perspective works as they'd 
never been able to see more than 20 feet thru the jungle in a straight 
line. (Couldn't say whether the story was true, but it's supposed to be.)

-- 
   Darren New / San Diego, CA, USA (PST)
     "That's pretty. Where's that?"
          "It's the Age of Channelwood."
     "We should go there on vacation some time."

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