I am interested in the Greenfield and Brownfield idea where all space started out as ‘untouched’ land such as agricultural or ‘green’ land and slowly through cycles has evolved into brownfield or previously developed land which has been left to decay. I think this can provide some interesting views on a space, showing a previously invisable historic map of a space where people have left invisible ’stains’ on the land making it brown. I like the idea of using GPS to map the marks people leave on a particular space in real time showing the slow decay of the space facilitated by the ’stains’ or ‘marks’ people leave on the space.