Summary: The probability that a system should have an equilibrium cannot be deduced from the
probabilities of the parts being in equilibrium. The case where they combine as a
product is likely to be common and important but it must be introduced as a specific
postulate. Cortex, sensory layering in Dispersion and layering in
Summary: The layering of the cerebral cortex may be explained as required for wide distribution.
Summary: Keeping things apart by giving them room to spread in is too wasteful. r things would require about r2 spaces. Dispersion amount of overlap The Multistable System : Keeping reactions apart by giving them room to spread is costly in material and space.