Impossible to describe. It's a different way of perceiving and understanding the Universe - it's like your base consciousness or what it means to be conscious. You're treading in philosophical-waters, where everything is murky.

The one thing I will say about being high or stoned is that when you look at different things, you do not see what is in-between your original starting point and the end object of focus. Your eyes kind of dart around and you are incapable of perceiving the sight in-between because, quite frankly, for a person who is high and under the impression of psychedelic/mental depressive, it's too fast.