Flat

Today started tight, I needed to get something done before the end of the day as I have to take Friday off to get an official document. However testing at another client exposed a bug in my code so we took it to bits are rebuilt it, and the new solution is better, cleaner and doesn't have a bug in it. Snag is I lost 4 hours on in, so I didn't have a hope of getting the thing I need to get done for a different client done. I worked late and managed to get about two thirds of the way there.

Today's blip is a rather odd close-up of something that I didn't even realised had dimples on it. Any Idea what this is, other than its flat and a but worn out like me?