" I’ll admit that I was staring. Suddenly my whole perspective had flipped inside out, like when you look at an inkblot picture and see just the black part. Then your brain inverts the image and you realize the white part makes an entirely different picture, even though nothing has changed. That was Alex Fierro, except in pink and green. A second ago, he had been very obviously a boy to me. Now she was very obviously a girl. "

― Rick Riordan , The Hammer of Thor (Magnus Chase and the Gods of Asgard, #2)