tunnel-microwave crux Theories on this crux ReadingVerdict Minor structure & design cruxes favored Discussed in IJ Book Club Ep. 26 (S2 Ep 6): The Founder Let You Guys on the Grounds — the Hal–Stice exhibition as the book's Mousetrap, the narrator's axe against Steeply, the Avril blind spot, the Bain letters (pp. ~651–673)