ABSTRACT
Why is an object seen erect when its image on the retina is inverted? In answer to this question the equally sensible question is sometimes asked: When one hears a baby cry with two ears, why does one not take it for twins?
Why is an object seen erect when its image on the retina is inverted? In answer to this question the equally sensible question is sometimes asked: When one hears a baby cry with two ears, why does one not take it for twins?