From The Next Web:
We may be approaching the end of the mouse and clicking on a screen rather than touching it, but for now it’s still alive and well. In celebration of that, Light Light thought that it would be a fun idea to gather the world to help them make a video for their song Kilo. By following instructions on the screen, you become part of the video as your mouse pointer is recorded, then added to thousands of others around the world.
Test it out here.