AND YET, STRANGELY, OUR ENEMIES THINK WE HAVE BECOME WEEK AND EFFETE: Brooklyn pre-K for adults is the latest thing in self-indulgence.

Whimsy is having a moment. In New York, men with full beards ride skateboards to work. Thirty-somethings join kickball leagues. Folks wait hours in line for novelty baked goods.

But a preschool for adults? . . .

Preschool Mastermind, which runs Tuesday nights in her Park Slope duplex, is doing well, she says. Her six students are enjoying activities such as snack time, nap time and show-and-tell. They are channeling their inner super heroes. Last week, they had a slumber party.

“It’s for adults seeking play and adventure and excitement in their life and community,” says Ms. Lapidos.

But wait, there’s more: “The school is not all play, all the time. Projects have also included writing self-affirmations in the form of commercials (in rhyme, of course), and envisioning an inner super hero who can conquer adult problems, such as procrastination.”

Take that, Putin.