Toward the end of his life, my dad struggled with dementia. One of the last times I spoke with him was by phone. I asked how he was doing, and he said he was pressed for time: “I can’t talk right now, we have a lot of guests here.” In the background, I heard his wife admonish him: “No, Al, you’re hallucinating.” Embarrassed, he said, in an expression of his own internal logic, “Oh, they aren’t people.