Public art existed all along, but ecological art just naturally grew out of my thinking and writings in that area for years. I didn't get involved in it; I started what then became a movement.

The tree is made by nature, mathematics by people. And combining the two is creating this beautiful alliance between humanity and nature. That's why my forests are mathematical expansion systems, all of them.

I went through about six or seven painting methods just to see what I didn't want to do. And then I got off the wall, and went into the environment.

I'm mostly self-taught. I didn't learn much in school.

We use up words as we use up images. We use up everything, and that's good, because it makes us grow.

I never considered myself a performance artist.

Anything important has to be almost invisible. And underrated. So the understructure should be underrated, but strong enough to hold the earth.