Cool! Looks like it'll do that in any browser + device combo that supports the device orientation API[1], including Safari on iOS and Chrome on most Mac laptops.

Here's little bit more information from a previous comment of mine, if you're interested: https://news.ycombinator.com/item?id=6547345

[1] http://www.html5rocks.com/en/tutorials/device/orientation/

Mouse movement over the graphic does it on desktop too, fyi