The Kuleshov Effects was named after Lev Kuleshov, a filmaker in the mid-twentieth century Sovet Union. Kuleshov shot a single long close-up of an actor sitting still with no expression, he then cut all the shot to work together. He only had two major scenes, one where a man in jail is shown in an open cell, and another when a starving man is shown a bowl of soup. Then he cut the two scenes so the starving man looked like he ws looking at the man in the cell, and the man in the cell was cut to look like he was looking at the bowl of soup. It wasn't a noticable difference. Kuleshov's effect aimed to fill in the gaps.

Sergei Eisenstein theory. 
Eisenstein believed that film montage could create ideas or have an impact beyond the individual images. A montage included putting two or more images together making a connected set of picture that made a film like feeling which made a better film.