Francis Bacon :: Enlarged contact sheet of two men wrestling, New York, from the studio of Francis Bacon, circa 1975.

From: ‘The Image as Question: An Exhibition of Evidential Photography’ at Michael Hoppen Gallery / src: theGuardian

“An enlarged contact sheet of two men wrestling in swimming trunks and caps, originally taken by Francis Bacon in New York in 1975, nestled for years in a bin bag in the attic of a Mr Robertson
from Surrey, who turned out to be the artist’s electrician. (Other bin
bags given to him for safekeeping included personal diaries, cashed
cheques, letters and holidays snaps.) The photographs highlighted in red
were used by Bacon as models for painting particular body parts in
motion. They echo another exhibit, a 17-frame series of a nude man
walking by Etienne Jules-Marey, whose motion studies preceded those of
the better-known Eadweard Muybridge.” (quoted from source)