But I do want to keep this idea of imagination in mind that the thing that humans are doing, especially young humans are doing, when they play, is imagining. They’re learning to imagine. They’re learning to think about how other worlds could be.

You think about this world by imagining alternatives to it. And you think, of course, about futures by imagining how the world could turn out. It could be like this. If this happens, it could be like that. This is why we can make bridges and have football teams and design weddings and have parties and have governments and so on and so on – because we can imagine those things.