Yet the fact remains that there is a dream reality with a "structure," "landscape" and images that appear to be made of matter — but matter that obeys different rules than those with which we are familiar. Dreams are not just psychological events. There is a dimension of reality (an "objective" dimension, if you prefer), in which all dream events happen. There are rules: Seth calls them root-assumptions that operate in all realities, our own included. We have to learn what root-assumptions govern dream reality.

p. 195 - Seth, Dreams & Projections of Consciousness, (1986)