Interesting what side-tracks you. On the way to Trafalgar Square, I dropped into the café in the crypt at St Martin's, only to be encouraged into their exhibition space - where all the exhibits in a show called "cARTographies" were covered in post-it notes. The idea is that visitors pay to remove a post-it, which one of the artists makes into another picture for the visitor. It's intended to be a rather laborious way of side-tracking the money-obsessed view of art: it's all explained on their website.

Enterprise deserves encouragement, and interest was obviously still slow to build, so I bought in. The artist drawing this little picture, after asking for a title for it, explained it as one part of a larger gridded picture, to which he would eventually attach a poem or story made out of the titles for each of the grid's squares (more maps, in a way). It would all be part of - well, a project that isn't mine to share with the internet, just yet, but one that anyone would wish him well in.