It would be bypassing the issue to say that the artist's business is how to work with this and that material and manipulate the findings of perceptual psychology, and that the rest should be left to other professions... The total scope of information he receives everyday is of concern. An artist is an isolated system,... he has to continuously interact with the world around him. Theoretically there are no limits to his involvement.

In: Art international, Vol. 13, (1969), p. 56; As cited in: Art Inquiry: Recherches Sur Les Arts. Vol. 1-4. (1999), p. 116