That's great! Is it your clock? When I was young at these tubes came out, I was totally amazed by them and liked how the numbers were jumping.
Great composition and well exposed. And it's of course right on the challenge topic.
Love it, and the way the viewer is drawn to the 8 makes me realise how much you thought about the setup. Does the clever positioning of the eight make me move from my intital seven or take it to nine?
I'm so jealous that you have a Nixie tube clock! Nice shot; the "cool" background color you chose works well to contrast the "orange hot" glow of the Nixie's...