Picture Book Structure: Mid-Point Reversal Stories

After attending Toni Buzzeo's wonderful workshop at The Writers' Loft on picture book structures, I started noticing them everywhere. The classic "3 Tries" theme is the most common, but one other I keep seeing pop up is the "Mid-Point Reversal" (or "Mirror"): Where half-way through the story the plot takes a sudden turn. A few recent examples of this are:  A Perfect Day  by Lane Smith,  Nana in the City by Lauren Castillo, and A Sick Day for Amos McGee by Phili...