If nothing else, Xavier Dolan‘s Mommy has made it clear that a 1:1 “pure box” aspect ratio doesn’t look perfectly square. It looks a wee bit higher than it is wide. Which was my very first thought when I saw it last May in Cannes. The next time an enterprising director shoots a film this way, he/she would be wise to deliver an aspect ratio of, say, 1.1:1 or 1.15:1. Then it’ll look right.