My point is that what it primarily explains are things at nanoscale. It can explain the difference in a pigment molecule very easily, and we know that it does. It can explain things somewhat larger than that, like the very special structure. When you're a kid, do you ever play with the feathers of a bird? You pull them apart, and then they zip back together. Those kinds of things can be readily explained by the mechanism as we present it. What I'm going to argue is difficult to explain is the change from one macroscopic form to another.