It becomes clear that both Doctor Parnassus and the devil need each other to exist. The back and forth between the two is a symbol of the constant struggle between good and evil and light versus darkness. The concept of good versus evil and whether one can exist without the other is a concept that comes up often in readings and films. This concept, good versus evil, can be visually symbolized on the Imaginarium with the black and white checkerboard pattern. The drawing on the mirror itself could show that evil and good need each other and that there is always a choice between the two. The Imaginarium mirror allows people to walk through it, and once inside their paradise or imagination, they must make a choice. The choice they must make is fundamentally a choice of good versus evil that determines the fate of their soul. It is a choice that allows them to return to seemingly better humans or be in the hands of Mr. Nick, the devil.,