Montage

Wikipedia - "Montage ... is a technique in film editing in which a series of short shots are edited into a sequence to condense space, time, and information. The term has been used in various contexts. It was introduced to cinema primarily by Eisenstein, and early Russian directors used it as a synonym for creative editing. In France the word 'montage' simply denotes cutting. The term 'montage sequence' has been used primarily by British and American studios, which refers to the common technique as outlined in this article. The montage sequence is usually used to suggest the passage of time, rather than to create symbolic meaning as it does in Soviet montage theory. From the 1930s to the 1950s, montage sequences often combined numerous short shots with special optical effects (fades, dissolves, split screens, double and triple exposures) dance and music. They were usually assembled by someone other than the director or the editor of the movie."
Wikipedia
W - Soviet montage theory
YouTube: Soviet Montage Cinema, Eisenstein's 5 "methods" of montage
YouTube: Movies in movies: A montage