The Listening Wall
Press any of them. The ring goes round while it plays, so you can see how much is left even if you cannot read yet.
Guess Who?
Press the button and something will make a noise. Then find it on the wall.
Placeholder sounds
Every noise on this page is currently synthesised in the browser rather than recorded — which is why they play instantly, with no files to download, and why the fox sounds more like an idea of a fox than a fox. Real field recordings replace them one file at a time without any of this page changing.