The Parting of Lot and Abraham is about their literal parting - Abraham took his family to Canaan, as God wanted him to, whereas Lot went to Sodom, and defied God's wishes. Now, having this in mind, maybe this mosaic does symbolize B. heaven, as Abraham and his family would go to heaven eventually, because they obeyed God's orders and wishes.
Surrealism was the first literary and artistic movement to become seriously associated with cinema. but not all films are generally are recognized as surrealism. surrealism was sought to release the creative potential of the unconscious mind in the 20-th century.