This started by taking a piece of scrap cedar and tracing the breaks in it. Those turned out to be the characters and the building under the horn. Everything else was created from somewhere else in my mind. I drew the blimp and decided it looked a lot like that image of mitosis from my 10th grade biology course, so I drew the other part as well..
I really like drawing strange architecture for some reason. Maybe it's from that time when we all discovered M.C. Escher in middle school or from Tim Burton. I've never drawn cartoon like characters so that is a first for me.