When I’m working with materials it’s not just the leaf or the stone, it’s the processes that are behind them that are important. That’s what I’m trying to understand, not a single isolated object but nature as a whole.

I have worked with this red all over the world - in Japan, California, France, Britain, Australia - a vein running round the earth. It has taught me about the flow, energy and life that connects one place with another.

I have six acres in front of my own house, which I very rarely work on. Most of the work occurs on farmers' fields around me. And I like the discipline of working on other people's land.

When I do the permanent projects or the big projects, when a work is finished, that's the beginning of its life.

The reason why the stone is red is its iron content, which is also why our blood is red.

We leave our presence in the pavement. We're walking over it, sitting on steps.

Occasionally I have come across a last patch of snow on top of a mountain in late May or June. There's something very powerful about finding snow in summer.