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P3D 3-DVG

>In other words if you have two almost identical 
>pictures, one with a red car in front of a blue truck 
>and a second virtually picture with the colors transposed.  
>You will find the (now) blue car still appears to be in 
>front of the (now) red truck. 

Surely the spatial clue comes from the fact that the car IS IN FRONT of the
truck! We are so used to perspective and the relative size of near and far
away objects that we just 'know' that the car is closer than the truck.

Seems very obvious to me....

Les, Dallas.


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