So I stirred a hornets nest eh?
If I made any mistake, it was perhaps in misinterpreting the original
posters description of 'perception of 3D' with 'seeing' 3D.
Of course we can 'perceive' 3D by a number of means, but to 'see' it,
you need two eyes. If you don't believe me, look at a 3D object and
close one eye. You still know the object has depth because you know
from experience that it has, but you can't 'see' it.
Peter at oimsdnp.demon.co.ukPeter.Robinson at oxinst.co.uk