The Black Horse of Eolian wasn’t a horse, in that same rippling way that Moonstar wasn’t a unicorn and Gray wasn’t a man. It made Wendy’s eyes itch every time the Story Beneath surged and suddenly Black wasn’t just a horse, he was every horse that ever was; every dragon, every hawk, every cat, every wild thing that couldn’t be tamed by man. And his eyes were green, and blue, and yellow, and a dozen other colors at once– but they never strayed from Riley. She was his Story, and he could no more leave her than Cat could fly.
Then the world hiccuped and Black was just a horse again.