Heidegger wrote a book called Was Ist Das Ding - What Is a...

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.