It would be a mistake to believe that the World-Idea is a kind of solid rigid model from which the universe is copied and made. On the contrary, the theory in atomic physics first formulated by Heisenberg--the theory of Indeterminacy--is nearer the fact. It does not seem that Plato meant the same thing when he described his theory of Ideas as referring to eternally existent Forms, but mentalism does not at all liken them to goods laid up on shelves in warehouses. Here they are simply the infinitude of possibilities, varieties, permutations, and combinations of elements through which the Infinite Mind can express itself in an infinite universe without ever exhausting itself.
-- Notebooks Category 26: World-Idea > Chapter 1: Divine Order of The Universe > # 117