So in both belief systems, there's this notion that the reality that we are in is a quasi-illusion. In the Upanishads, it's described as maya. That there is a true self, that there is this atman, which is of the same substance as the true nature of reality, of Brahman. That all things are actually connected. This notion of the individual is just an illusion. It's illusion given to us by this maya. And the maya isn't just our sensory perception, it's even our notions of ego and possibly even time's base and causality.