Can you guess?

Whilst my parents were out walking the dogs, I tried to get a picture of the trees shadow against the deep blue sky, but my camera decided to be fussy. I then noticed that it was taking the pictures slower due to how dark it was, so then used this opportunity to do what I use to do as a child with my old camera on drives with my Dad. I moved my camera in a swirl shape and got this simple effect from the street lamp outise