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

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.

As with all my work, whether it's a leaf on a rock or ice on a rock, I'm trying to get beneath the surface appearance of things. Working the surface of a stone is an attempt to understand the internal energy of the stone.

Abandoning the project was incredibly stressful after having gone through the process of building the room, installing the kiln, collecting the stones, sitting with the kiln day and night as it came to temperature, experiencing the failures.

I think I have been fashioned by the fickle weather of Britain that it is - it's forever changing. There's no kind of constant sun or dry weather or freezing weather, and I'm always having to change and adapt to that.

Even in winter an isolated patch of snow has a special quality.

The difference between a theatre with and without an audience is enormous. There is a palpable, critical energy created by the presence of the audience.