Some of the snowballs have a kind of animal energy. Not just because of the materials inside them, but in the way that they appear caged, captured.

The main reason I went to digital was because I got time-lapse, video, and still images all in one camera. Having a minimal amount of gear is really important for someone who wants to walk around. That allowed me to have this flexibility to document things in different ways.

People are the nature of the city, and you can feel it in the pavement.

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.

Winter makes a bridge between one year and another and, in this case, one century and the next.

Photography is a way of putting distance between myself and the work which sometimes helps me to see more clearly what it is that I have made.

Not being able to touch is sometimes as interesting as being able to touch.