"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.