As a challenge to myself, several years ago, I decided to draw various medical conditions that individuals posted to an online form. My goal was to complete them in 20 minutes or less. (https://redd.it/15ozod) Redditor wendalina requested, “A gall bladder that is healthy vs. unhealthy (gall stones and no longer functional). Had these problems myself and always wondered.” This one took 30 minutes.