It was a very pleasure and fun to realize this quick sketch. Done for an italian blog (http://iodisegnoamodomio.blogspot.it/), for a mini-contest: realize a quick sketch in 24h following a main theme. In this case the "theme" was DOUBLE. I immediately came to mind the story of Doctor Jeckyll and Mr. Hyde as you can tell from the picture. Unfortunately I hadn't enough time to complete the whole illustration(colour).