Where Breuil has seen chaos—or at least, randomness—in wall art, Leroi-Gourhan sought and found order. - Richard Leakey

We are justified in calling all species of bipedal ape "human." ...the adaptation of bipedalism was so loaded with evolutionary potential—freeing the upper limbs to be free to become manipulative implements one day—that its importance should be recognized in our nomenclature. These humans were not like us, but without the bipedal adaptation they couldn't have become us.

Of the range of images in Upper Paleolithic art, the most arresting are the therianthropes. There are not many... but they seize the imagination. The most famous is the so-called sorcerer... In a manner unusual for Upper Paleolithic images, the sorcerer is staring directly out of the wall, a full-face stare that transfixes the spectator.

Jerison argues that we should think of brains as creating a species' version of reality. ...As brains enlarged through evolutionary time, more channels of sensory information could be handled more completely, and their input integrated more thoroughly.