The intelligence that collects silently in BL-5 is not what is usually called intelligence on tests. It’s like the Taoists who sit in a cave and go deep into the wells of silence. Who can say what it is that you learn from this, exactly? You don’t come back from the cave or sitting on the rock with something that you could publish. But you may walk back into the house and say something to your kid or to your husband that is very different somehow. Or maybe you say nothing, but you can hear them better, with a much quieter ear.