To illustrate his point, Wilson draws on the story told by Princess Rosalina, whose life story is recounted throughout Galaxy. Although this narrative thread starts life as the kind of standard fare you'd expect from a Mario title, Rosalina's tale quickly becomes tragic, as she recalls how she realized her mother had passed away -- or, as she touchingly puts it, is "sleeping under the tree on the hill." Sad face.
As Wilson points out, this surprisingly poignant turn of events creates a pretty weird dichotomy. After all, Galaxy is a game where you fight a giant piranha plant in a diaper.