Ten years ago, back in 2002, I made an animation concept for a short film which is dealing with some scenes in an underground station. Actually I thought all data of it was completely lost together with the hard drive which broke with my former computer.
So, you can imagine my excitement when recently I found some printed screenshots of it after all the time by chance. The background was a two-tone drypoint print and the characters were animated with a kind of digital cut-out-animation in an ancient software called Moho (which got advanced to Anime Studio later).