If you click, a persistent copy of your mouse pointer is left behind at the specific location you clicked on, for a little while.
There are various objects in the room and so you can play around with illuminating them by moving your mouse pointer over them, or drawing text or images with light.
It was pretty awesome before it got overloaded!
(You should probably visit it with a device with a mouse rather than a touchscreen.)
The artist is Yuta Sasaki and this link goes more detail into this cool project: https://sasaki-sasaki.com/info/en/alive_en/
Can't believe this made the front page. Hopefully it gets back on soon.
Web devs: don't do this.
Uncaught TypeError: pointerContainer is nullWhat's that? Do you mean this? https://en.wikipedia.org/wiki/Motion_JPEG