I don't mind spending days, weeks or even months on a piece of art, but sometimes it's good to cut loose and work quickly. When I was a student I went on a two week residential art course in South Wales, where we were encouraged to do just that. I remember one of the assignments involved being dropped in Pontypridd market and told to produce as many pen sketches as we could, aiming to capture people as they stopped to buy bananas and so on, almost a candid camera approach where the work would...