"Heidegger wrote a book called Was Ist Das Ding - What Is a Thing? which was kind of interesting and influential to me, as a matter of fact. It's a small paperback, which I read. It's about the nature of thingness; what is it? It's a very penetrating analysis of that, and I think a rather influential book. I know other artists who have read it and come up with it."

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There are really three players: 'absolutists', for whom it is possible to describe reality as it anyway is; 'constructivists' or 'humanists', for whom there is nothing beyond a world that is relative to human interests and conceptual schemes; and 'ineffabilists', like myself, for whom any describable world indeed exists 'only in relation to man', as Heidegger put it, but for whom, as well, there is an ineffable realm 'beyond the human'.

— David E. Cooper