What did John A. Wheeler mean when he said "Participatory principle. According to it we could not even imagine a universe that did not somewhere and for some stretch of time contain observers because the very building materials of the universe are these acts of observer-participancy. You wouldn't have the stuff out of which to build the universe otherwise. This participatory principle takes for its foundation the absolutely central point of the quantum."? Central point of the quantum? How if at all can we apply this principle to modern Cosmology?