Summary: The probability that a system should have an equilibrium cannot be deduced from theprobabilities of the parts being in equilibrium. The case where they combine as aproduct is likely to be common and important but it must be introduced as a specificpostulate. Cortex, sensory layering in Dispersion and layering inSummary: 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.