When I was young, an overeager student teacher once gave us an assignment to discuss a superpower we wished we had. I wrote about being invisible. For days after, boys in my class bumped into me then said, with phlegmy bravado, “Didn’t see you there,” and I wished I’d been able to explain that to be invisible didn’t mean to disappear, but to have control over who might see me, and when and how.

