
In this case, the Upside-Down is not only an alternative universe, but the alternative universe par excellence, that is, it is double, the shadow, the dark side of the moon, the unconscious against the super-ego. It's like Dr Jekyll and Mr Hyde, but also as the portrait of Dorian Gray. And then the question becomes interesting: what is the real part, the one that appears or the hidden and decadent one? Do you have to kill the monster or unmask the falsehood and the hypocritical mask?