[nsxwolf]

I don't like the elastic sheet analogy because it doesn't work without gravity, the very thing it's attempting to explain.

[chias]

I like it because it isn't quite as self-referential as it at first seems: the notion of gravity that it requires is not the notion of gravity it is explaining: it uses the colloquial and accessible idea of gravity (i.e. "things fall downwards") to describe a more precise idea of gravity (i.e. "things fall towards each other in accordance with mass").

[atilaneves]

This has always bothered me as well, and I'm surprised that this is the first time I've seen anyone else mention it!