This is pretty cool. Make some music! Thanks for the heads up, Eric.
Space bar clears it. You can also right click and copy paste. You can get extra creative by opening up multiple tabs.
The creator’s blog post about it is here.
Hmm so going off his blog, it looks like he based it off something called the Yamaha tenori-on, but each note acts like an omni-directional wave to trigger surrounding notes, but with diminishing amplitude? Or something like that; I actually have no idea what effect the waves have on the audio, if any. Each wave can also bounce off the “walls” or interact with other waves. Pretty neat.
He also has some cool stuff in his lab: http://lab.andre-michelle.com/