" What was a little dark, anyway? Just no sun, [Petra] reminded herself as her sneakers pounded toward the opening. Just dark, all three fine, she whispered to herself again and again, spinning the words outward into a mobile in her mind. They floated into dark-three, all-just-fine and then into all-fine, dark-just-three. "

― Blue Balliett , The Calder Game (Chasing Vermeer, #3)