For those that don't get this: if you visit the site on a mobile device, you get a keyboard. If you press one of the keys, you will create a sound on the (desktop) page.
It's reasonably instant, so you find out which sound was yours.
They say (can't seem to be able copy/paste it) "visit the site with your mobile device" at the top, so I assume it's only targeted at mobile users, or something.
They should have given the ability to stop the rotation at a desired place, so that I could check whether on pressing the mobile keyboard button a sound comes up from my geographical location.
It's reasonably instant, so you find out which sound was yours.