Oooh, this is nifty! Drag your mouse over it:
via Galleycat
Sadly, it's Flash, so it won't play on many mobile systems. Sorry. It seems a pity that someone would go to so much trouble to make something on Flash, which has been slowly fading into the west ever since the iPhone launched, and is now Officially Dead.
How easy is it to do something like that in HTML5? That's a real question. I've no idea how this stuff works. But I think it would be cool to have a cover for Hild where the grass ripples, the trees shiver, and the water laps...