On a visit to that National Trust property at Cotehele we walked down to the lower part of the estate on the banks of the Tamar. Here they have a working water mill where you can bring your own grain to be ground.
I was fascinated by the water wheel and it was possible to get very close to it as it turned past, though in a very dark space. Given the relatively long exposures required I was not entirely optimistic about the outcome of trying to shoot it handheld.
I was, however, delighted with the results I achieved. Most shots were blurred of course, but this one captured not only the motion of the water wheel but also the droplets of water flying off it.
I remembered experiments with cloud chambers in the physics lab from when I was younger and the colliding water droplets reminded me very much of the cloud chamber trails.