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.

People always understand everything in retrospect.

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.

Pattern-finding is the purpose of the mind and the construct of the universe. There are an infinite number of patterns, some of which are known; those still unknown hold the key to unresolved enigmas and paradoxes.

What I did for my last act as a painter, if you call me a painter, was to photograph the weave of the canvas, and enlarge it and enlarge it until it became like a landscape.

Philosophy gets its ugly head into everything, but I don't think we live philosophy anymore. It's done.

Words are changing. I find that old expressions are outdated, so when I write something, I try to find a new expression that hasn't been born yet. It's difficult.