In a message dated 01/06/2000 4:28:50 PM Eastern Standard Time,
[log in to unmask] writes:
> She let babes of various ages crawl out across a surface that at a certain
> point became see-through. If the babe looked down and continued forward,
she
> checked the box Does Not Have Depth Perception. If the babe stopped, looked
> down, became upset or otherwise involved in the view below, she checked the
> box Does Have Depth Perception.
I remember seeing this experiment on a PBS Nova show once.