I love bringing my six-year-old to the Metropolitan Museum of Art when we are in New York in the summer. On Thursdays, they have a special hour for children. A curator first talks with them about an artwork and then encourages them to draw pictures inspired by it. My son seems to enjoy it. Yet every time I tell him that we are about to go to the MET, he says that he doesn’t want to. Don’t you remember, I plead with him, that you liked it last time? No, he says, he didn’t. I cajole and bribe, and keep hoping that a day will come when he will remember how he felt about it last week.