When a ghost girl with no legs spots a pair of disembodied tap shoes dancing to “Moses Supposes” from Singin’ in the Rain, she joins in, gleefully providing a body to accompany their fancy footwork.

Back in 2012, Joe Cappa left a career with an ad agency in Oklahoma and moved to Denver to focus on freelance video work and painting. He soon set out to learn animation so that he could bring his ...