“A feather is a miraculous thing. So commonplace and every day, we barely even notice them poking out of our pillows, or caught on a gentle breeze, or bobbing along the surface of a lazy river, caught in the eddies and rushing vortexes as it’s swept downstream. But a feather is a feat of engineering. And this feather, the one that must have been slipped beneath my bedroom door, is a beautiful one to be sure.”