This is a fruitful exercise in collaboration. Thirty photographers, who belong to the Photography Institute’s London Facebook group, each created an image on a single theme – abstract. This was the brainchild of Darren Sharp, who skilfully pieced together this wonderful montage.

We were all struck by the diversity of images, and how each individual responded to the challenge in such different ways. It combines the best of individual expression and joint effort.

My contribution comes from a simple object in a west London park. At close quarters, its dimpled, textured surface is hard to define and has its own synthesis – the essence of abstract. It’s little more than a lowly stone bench, dappled by the sunlight and then treated with a light sepia tint to bring out the contrasts.

This is the original cut of my photograph – which stands alongside so many impressive pieces of work.

• Bruno Conceicao, another of the 30 photographers, has written about the project here. He also reveals more about his abstract image.