It'th a Mythtery

Anyone hazard a guess as to what this is a picture of?

I was trying to photograph the hailstone damage to the bonnet of Kate's car... What I ended up with was a very shiny swirly reflection of the siding of the house!

If you look carefully you will see the little round dents where the pattern appears to go awry.

Those little round dents will be costing the insurance company $2800 to pop out.