In the film, Bethany is the author of her own perspective on reality, which gives her a god-like quality. While John is dealing with ends and beginnings within himself.
The artist Clinton Lugert of THEY design chose to focus on the film's alternate perspectives as well as the rift in the primary relationship, which lead him to base the Key Art and poster design on the ancient Roman god Janus.
Janus is the two-faced god that looks both to the future and the past and is therefore the god of beginnings, transitions, time, gates, passages, and endings. He presided over the beginning and ending of conflict. War and peace.
The Venn diagram within the layout not only shows the intersection of the characters, but is also an abstraction of blurred city lights.