This image is really an exercise. I wanted to play around with balancing a round shape with a square one, i.e. the frame. Of course it goes without saying that I wanted to avoid the uninteresting and static mirror symmetry option.
The mirror is a magnifying one which meant that, if the frame was in focus, whatever was in the mirror wouldn’t even be close to in focus. I wanted two blurred areas, the background and the mirror surface, one square and one round. I didn’t want recognizable things confusing the issue.
This may seem like a trivial use of time but it is doing this type of exercise that informs compositional decisions when photographing the ‘real world’. I always come away understanding more than when I started.