Years ago, I was too full of myself as a teacher. I liked to talk, to expound, to embellish. I liked demonstrating, showing off a bit. When it was time for my students to do something, I often did it with them, and talked them through it, which meant I was not really seeing my students. But no matter. I would say things like, “Good, very good. That is coming along.” But honestly, I was not watching anywhere nearly close enough.