During the week of very fine weather a couple of weeks ago I went down onto the riverbed as the City ferry was leaving Putney Riverside Quarter and tried to paint a plein air picture of the scene. It was about 7am. I realised that the light was changing far too fast and abandoned the picture after 20 mins. However, to avoid complete frustration I spent 15 minutes recording 2 groups of 3 colours. The groups consisted of a colour 'swatch' of the sky, buildings and water, at the left hand end of the horizon and at the right hand end. Rather than thinking of them as 'colours', with a 'name' I tried to think of them as 'visual perceptions' or 'juxtapositions'. The 2 groups are circled in white on the plein air sketch. When I returned to the studio I used my photographic reference from the scene and the 'colour perceptions' and put together the above, reasonably satisfactory picture. I think it may be a stronger picture if the ferry was a bit further to the left. An interesting exercise though.