On Bongard problems and the shape of thought

When you first encounter a Bongard problem, it’s a bit like hearing a joke, and everyone but you already knows the punchline. You’re given a set of six images on the left, and another six images on the right, and you’re told that all of the images on the left have something in common, but the images on the right don’t. That’s it. No choices, no hints. You might “pick it up” quickly… or you might…