Montage is making a composite photograph by cutting and joining two or more photographs into an illusion of an unreal subject.
David Hockney – Boring in England (1937), David attended an art school in London. Soon after he moved to Los Angeles in the 1960’s. David didn’t start working on photography until the 1970’s creating photo collages.
Cubism: Characterized by the reduction and fragmentation of natural forms into abstract, often geometric structures usually rendered as a set of discrete planes.
Pablo Picasso was an artists who did cubism, one of them being Les Demoiselles d’Avignon.
Cubism and photo montages are similar because you use smaller pieces to create one big piece of art.