"Abstract Thursday" - On a Roof

I parked on a rooftop carpark in Newcastle which I don't often use, and discovered that it's a veritable blip treasure trove. I'll be back there soon!

In the meantime I thought this would do for Abstract Thursday - it shows the ducts of roof-mounted air conditioning units with a little bit of Photoshopping.

Many thanks to youoregon1 for hosting Abstract Thursday.