The subject isn't unusual, but I think the treatment is. I live in Winchester, a small town in the south of England, which has a famous cathedral. Since I live here, it's very difficult to find anything in town (especially the cathedral) which I or countless others haven't photographed many times. However, it had been raining hard yesterday and I happened to be taking a short cut through the cathedral grounds and noticed its reflection in a large puddle - which got me thinking about an "Alice through the Looking Glass" effect, the stories of "drowned cathedrals" and what might happen if I could go through the puddle into the world behind the reflection.