Sentence:  Examples of <WSD>montage</WSD> are seen in many modern films, and it is not a device which is physically difficult to use. The difficulty lies in the proper conception of the complete <WSD>montage</WSD>, for the cameraman must so completely visualize the finished result that he can proceed to assemble the various units without, at any time, seeing them as a whole until the film is processed. 
Meaning of the word marked with <WSD> tags:  A composite work, "particularly" an artwork, created by assembling or putting together other elements such as pieces of music, pictures, texts, videos, etc. (from early 20th c.)