
History shows that the human mind, fed by constant accessions of knowledge,
periodically grows too large for its theoretical coverings, and bursts them
asunder to appear in new habiliments, as the feeding and growing grub, at
intervals, casts its too narrow skin and assumes another...  Truly the imago
state of Man seems to be terribly distant, but every moult is a step gained.
		-- Charles Darwin, from "Origin of the Species"
