Why you don’t see your nose?

Your schnoz is right there between your eyes all the time, so why don't you notice it?

It's a brain thing. The brain treats the nose as irrelevant. It is there, always, and there is no need to notice it. (You can see it if you try). The nose blocks out some information coming into each eye, but the brain builds a complete image by using pictures from both eyes to fill the gap.