'My materials are elemental: stone, water, mud, days, nights, rivers, sunrises. And our bodies are elemental: we are animals, we make marks, we leave traces, we leave footprints.' Walking and Marking catalogue, Richard Long, (National Galleries of Scotland)
So I am still pondering - what form do our marks and traces take on pavements, and surfaced paths? Narrative lines drawn in snatches of conversation or thought left hanging? Scuffs and smells and litter trails? Furrows of displaced air?