People say, what about all those planets in A Wrinkle in Time? Well, I was hatching A Wrinkle in Time while our family was taking the ten-week camping trip that I describe in The Moon by Night. Everything I describe in Wrinkle is something I saw on that camping trip. You see something small, and then you can enlarge it. A possible planet (which I didn’t use) came to mind in Yellowstone where I looked at a pool about four feet around of bubbling yellow clay. Now you can easily take that little four-foot pool of bubbling yellow clay and make an entire planet out of it. So you see something real, and then you do what is called extrapolating.