To see is to think, and to think is to see. - Richard Serra

With any work of art, what happens is if you're open to seeing it you probably have a sensation," he tells the talk show host, "and that sensation leads to an experience and that experience is private and deals with your background, where you were born, what you've been exposed to, who you know, what your education was; and it will lead to other ways of thinking about other things.

Space, as my work evolved, really became my subject.

You can talk about the 'how' and the 'what', but "when you get to the "why" it gets a little more difficult.