For example, the optic nerve fibers from a given small part of the retina all go to a particular small part of the lateral geniculate, and fibers from a given region of the gcniculate all go to a particular region of the primary visual cortex. Such an organization is not surprising if we recall the caricature of the nervous system shown in the figure on page 6, in which cells are grouped in platelike arrays, with the plates stacked so that a cell at any particular stage gets its input from an aggregate of cells in the immediately preceding stage.