The great challenge is how to make smart, intelligent art that can speak to everybody.

My first reaction to finding Robert Smithson's Spiral Jetty in a book was, Wow, what a great photograph! I could not believe that someone had gone to so much trouble just to end up with a picture.

Only in the 20th century, artists started taking the study of perception in a more humane way. They were thinking about the eye as being an instrument, the whole body as being a visual instrument. That sort of gave way a little bit with Cartesian­ - the "Cogito ergo sum" argument. It's not, "I think therefore I exist." It's, "I feel therefore I think therefore I exist."

Now that photography is a digital medium, the ghost of painting is coming to haunt it: photography no longer retains a sense of truth. I think that's great, because it frees photography from factuality, the same way photography freed painting from factuality in the mid-nineteenth century.

When you organize your work and look back at your entire production, it may feel like you're looking at a straight line, but in fact it's nothing like that. The work is very experimental and most of the time it develops like branches. I usually see a capillary, like a tree shape where there are... branches that sort of move because you're not tending to them.

I think pure light has something to do with actually seeing everything at once. It's kind of a nirvana of sorts.

In the back of every painting there's an entire universe that makes it possible for the painting to be there: an army of conservators, technicians, people who maintain these things, the market.