This lithograph edition of the left panel from Bacon’s 'Three Studies of Male Back' triptych is a portrait of George Dyer, Bacon’s lover. The nondescript interior space is a device used to focus the viewer’s eye on the human figure, which is facing away, and reflected in a shaving mirror.
Dyer is sitting on a pedestal, and a trapezoidal framework encloses him, in a way trapping his body within strict confines.