Snails have long appealed to cartoonists (Sam Gross’s “I don’t care if she is a tape dispenser. I love her.” remains an all-time favorite gag). And also to me—as a kid, I had a pet snail named Milo ...

Gary Varvel draws cartoons on an iPad Pro in an app called Procreate. In this time lapse video he shows a feature of the app that enables the artist to upload resource material into the cartoon.