A hundred years from now, maybe humans can live for a thousand years; a thousand years later, they might live for ten thousand years, and after ten thousand years, they die. Humans say others will remember, but after a hundred million years, everything is gone. What's the point? Playing with sand is just playing with sand; as long as it's fun, that's enough. Humans, don't overthink it.

Humans, be serious, building sandcastles requires skill; humans, be carefree, when the tide comes, it comes, that day will arrive sooner or later.

If you ask me about the meaning of fun itself, fun is just fun, it doesn't need a meaning; if you press me on whether 'not needing meaning' itself has meaning, I'm already busy building sandcastles.