The short answer is that I've swapped Pentacles for Wands in my deck; try relating this to the RWS/CH 8P.
The long answer... well, it's what came out when I contemplated the keywords found in my reference material for the 8P. It was originally going to be set on a blasted, grey plain but it shifted underground midway through the sketch. I mixed in a bit of that nuclear fear that wandered around the eighties, a bit of unexpected fangirling on David Macaulay's architecture fetish children's books, and got this. Saving stuff away for later.