In this wet and chilly week in London I have been taking my camera with me wherever I go as The Guardian's March assignment is to photograph 'Found Onjects'. Now, in this I think they are looking for the jetsam and flotsam we see so often between pavement and wall, in the road's gutter and blown against hedges and fences. As a photographer, I tend to walk around with my peripheral vision tuned up to 100 and, for this assignment, I'm being particularly vigilant. Litter, usually the target of my anger and frustration, is now being seen, albeit for one month only, as a potential subject of a shot or two. Of course, I put it in the bin afterwards!

Here's a shot of a ball I found in the middle of the very road on which I live.

I've made it a rule to leave the subjects exactly as I've found them, so finding this ball was a huge stroke of luck. For the series of shots I have also made afew additional rules to stick by; my own brief. I am shooting every shot with a large aperture (the shot above was shot with an aperture of f1.8) which gives a shallow depth of field. This rule will give a consistent look to each of the final six shots and also gives a sense of mystery to the context of the subject. The idea is for the observer to think about the history of the subject; how did it get to where it is now; who used to own it?

This shot explores the detail of the poster and it's envelope and also shows the beautiful colours and textures of the tree's bark. It's almost a tabby tree.

Some subjects have accidentally come to rest where I've found them whilst others have been placed by someone unknown. It is the temporary nature of the location that is interesting.

The last assignment of mine, 'Reflections' was reviewed by The Guardian. You can find the review here. So here's hoping for another one for this assignment. There are a couple more shots below.

A builder's ladder resting against a sunlit wall.

A wooly hat left on the park railings.

A cone next to some painted stumps.