It melts eventually.

[ Simply that. ]

Um, the happiness. Nice... for a while, and pretty to see. You can do a lot with it too. Since it comes from water, it's pretty fluid too.

[ So that happiness can look like a different things to others, maybe even sturdy in its own way... like an igloo, and Siffrin struggles to put it into words as he tips the wine glass further back this time. ]

... No matter how solidly you pack it, or how everlasting it seems... it'll dirty, melt, and disappear. That kind of thing.