Fireworks, flipped

I was taking pictures of fireworks, and they were pretty cool, but I liked this one more - it is all the people out on the breakwall watching fireworks. Obviously the shutter was open forever - but I don't mind the double effect, it shows how it was over a long period of time.

The only light source was the actual flashes from fireworks - and that one in the background of course. Anyway, just thought this was a unique shot I'd share.