From Bikers’ Mardi Gras artists’ book
by Daniel D. Teoli Jr.
Cartier-Bresson would routinely turn a contact sheet all around scrutinizing a photo from every direction. I can’t say what he was looking for, HCB was not known for displaying upside-down pix.
Here is a good example of a photo that worked better presented upside-down.
(Not my photo.)
In any case, it is a good reminder to approach a subject from all directions.