See the word "pose" in juxtapose? When you juxtapose, you are "posing" or positioning things side by side.
The verb juxtapose requires contrasting things placed next to one other: "The collage juxtaposed pictures of Jane while she was growing up and as an adult." Juxtapose is used often when referring to contrasting elements in the arts. "The music juxtaposed the instrumentation of jazz with the harmonies of soul."