Caravellum

You can try to steal me but I’d catch you, or so they say. You can try to bend me, but such things as gold and silver are beneath me. In short, I’m a promise that our paths will cross again so I hope beyond hope that you’ll remember me. What am I?

Ah, it is fair to say that I inspire caprice, for I am lightest when I am full, which can make me blue. But just look at me and you will see, I may be a hare in the north but I’m still a man in the west. What am I?