helps to create motifs sometimes called parallels. Parallels cue us to compare two or more distinct elements by highlighting similarity.
ex; wizard of Oz --> dorothy says she feels has known the scarecrow and the tin man before and previously in the film the farmhand's are gathered around in a similar farming and they mention some of the characteristics of the lion tin man and scarecrow.
Believed to be an allegory for the politics of the time: Dorothy represents the common man, scarecrow represents the farmer, Dorothy's silver shoes represent the silver standard, the Tin Man represents the industrial worker, and the Cowardly Lion represents William Jennings Bryan