Last summer, in Italy, I stood gaping before Michelangelo’s David and reflexively took a photo—no flash, but forgetting that all tourists’ photos of him are banned—and got chastised. Supposedly Michelangelo said he made the immortal statue by just chipping away what didn’t look like David. I’ve thought of writing as having to first create a block of marble, then pounding it into a narrative. Which must be an evident metaphor, because Bill Roorbach mentioned it in his blog’s recent advice …