Why do 3D pictures stand out or appear recessed?

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Offline thedoc

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Why do 3D pictures stand out or appear recessed?
« on: 14/06/2012 12:30:01 »
Martin  asked the Naked Scientists:
   
The 3d pictures that one gets: why is it that some people see the object standing out and others see it indented ?
 
Martin van Wyk

What do you think?
« Last Edit: 14/06/2012 12:30:01 by _system »