It seemed absolutely clear that industry did not require the presence of a rational being to maintain itself. Basically, industry consisted of manual laborers, always performing the selfsame tasks, who could easily be replaced by apes; and, at a higher level, of executives whose function was to draft certain reports and pronounce certain words under given circumstances.

Pierre Boulle, Planet of the Apes [Amazon, Bookshop, Publisher]

Hermetic quote Boulle Planet of the Apes industry manual laborers selfsame tasks replaced by apes