Some archaic theories of vision propose that the eye rather than being a receptor of images is an organ of projection — beaming images into the world. We are apt to dismiss this as naive since it seems to us obvious that light travels from objects into the eye and not the reverse. Yet if what we see is actually inside our eyes why do images appear to be outside us in the world beyond? Is it not the case that the appearance of the world is precisely a projection, not by the eye as such but by the combination of eye, brain and body in motion? In fact, what we see is not 'out there' at all, but occurring behind our eyes in the visual regions at the back of the brain. Nothing we see is 'out there'.
