"Yes. And I'm not. I expect it'll smooth over. Why did you make the worldbook planet turn like that?" she inquires.

"Because it amused me," says Libby. "It's a planet. Planets rotate."

"What planet is it meant to be?"

"None in particular. It has about Earth's size and rotation speed but an unrelated geography."

"Earth's size?" asks Glass archly.

Aurora writes stuff.

"Scaled appropriately, yes."

"What does it mean for something to be Earth's size, scaled appropriately? Isn't it just... smaller than Earth?"

"If it were a picture of Earth, wouldn't you say it was appropriate to say it was a picture of a planet with Earth's size and rotation speed?"

"Uh, I wouldn't say it that way, any more than I would bother to mention that a photo of me is a photo of someone who is my size. And this planet isn't a real planet somewhere, right? Maybe you're cashing out rotation speed as a miles per hour thing instead of a revolutions per day thing...?"

"It's an imaginary planet, but size is still an attribute planets have, even when they don't physically exist. I'm not an artist; I didn't imagine this picture and then decide it should display planetary rotation. I imagined a set of characteristics for a planet, and then I had the magic generate an appropriate image. If I'd imagined a planet the literal size of the picture on the cover of this book, it would be a lump of rock, or maybe a neutron star."

"Okay," shrugs Aurora. "Well, that's my profile - nice revisions, Glass." And she wanders off.