I saw my twin at a Halloween party. She looked uncomfortable and slightly sad. "I'm a spirit of Mordor," she explained. She had hand-stitched a simple costume; her older daughter, she said, had recently discovered an obsessive interest in Middle-Earth. My twin added that her younger daughter was ill--the younger daughter is pretty much always ill--and that her spouse was on "sickbed duty." The spouse is a quirky professor of physics. It's evident that my twin admires her spouse--and, also, that she has to tie his shoes for him. "Clearly, I'm a pumpkin," I declared. Then, a confession: "I had a daydream about becoming a pencil sharpener, but I just didn't move fast enough." This is all a prelude. What we want to discuss is picture books. We get there--finally--and it's like we have attained precious oxygen supplements at the top of Mount Everest. "EXTRA YARN is outstanding. And then when you see what Jon Klassen does on h...