Screens are no longer simply bicycles for the mind; they are bicycles that children can ride anywhere, into the virtual schoolyard where they might encounter disturbing news photos, bullies, creeps, and worse. Setting a child free on the Internet is a failure to cordon off the world and its dangers. It’s nuts. We inure ourselves to this craziness by relying on the basic innocence of kids: they could type all sorts of unseemly things into that Google search box, but they usually don’t.

The comfort of games is that they are partially walled off from the larger Internet, with their own communities and leaderboards. But what unsettles parents about Internet gaming, despite fond memories of after-school Nintendo afternoons, is its interconnectivity.

Minecraft is played by both boys and girls, unusually. Players can join together to build worlds together: airports, castles, cave systems, roller coasters, an accurate replica of Westeros. At its best, the game is not unlike being in the woods with your best friends. Parents also join in. The Internet is full of testimonials of parents playing with their kids, of children reading their first word in Minecraft, and other milestones usually performed in the analog world.