The site is instantly recognizable: the white minimalist background, the globe logo in the corner, the blue links. But it’s from a different era, and there isn’t even a search bar.

Now, Wikipedia has an iconic audio mark of its own: a fluttering of book pages, keyboard clicks and synthesize tones it calls "The Sound of All Human Knowledge." ...

Thanks to the power of crowdsourcing, Wikipedia now has a sound logo of its own. The internet’s favorite encyclopedia is calling it the “Sound of All Human Knowledge.” ...