"Are the forms of animals consciousness, which have been demonstrated in anthropoids, grey parrots and dolphins and which appear similar to ours, really comparable to ours?
Does not human consciousness originate primarily as a product of the sociological conditions of its coming to being? Doesn't animal consciousness have to be something quite different, something we cannot imagine? Or is there a basic measure of consciousness, which is part of man's biological makeup and also occurs in animals?"
(C. Höller quoted in C. Höller and R. Trockel, Ein Haus für Schweine und Menschen/A House for Pigs and People, Documenta X 1997.)