"It's like... trying to imagine a world without light. Or gravity. Or sound. Sure, maybe it's possible, but it seems kind of impossible that without something that important you'd still get humans, or anything like them."

Ylva conjures a little jet of flame, which she rolls briefly over her fingers before extinguishing in her palm. She shakes her head, as though tsking the entire concept. "I bet dinosaurs are extinct where you're from, too."