"What happens is that the man's head is replaced by an animal; but this is not the animal as form, it is the animal as outline, for example the trembling outline of a bird which spirals over the cleaned area, while the simulacra of face portraits, beside it, serve only as 'witness.'" G. Deleuze, "The Body, the Meat and the Spirit: Becoming Animal." http://home.pacific.net.au/~robertl/fbacon.html. (Deleuze is addressing the paintings of Francis Bacon.)

"The primitive man who avails himself of dolls and drawings in order to bewitch is generally quite indifferent to the lifelike character of his magical instruments. The typical volt gives only a crude outline of the human body, and, what is most remarkable, it does not display any likeness to the man who is to be bewitched." Y. Hirn, The Origins of Art. New York, 1971.