this thought was more than he could bear. he raised his head and began to howl: the oldest custom among his kind, to howl at the moon. even if it was of course the sky you were really howling at. and that was quite sensible; wherever you could be, there was a lot of room in the sky - enough room for the loudest, agonizing howl. and of course it was important, very important, that anger and pain had enough room when you let them out.
otherwise they could have come falling back to you and smother you.