Thoroughly mesmerizing.<p>If you do a bunch of short clicks in one place to gather all the particles, then hold down the mouse button you can get some amazing pulsating effects.<p>Additionally if you hold down the left button while slowly moving the cursor around the screen all of the particles will 'slingshot' around the well and quickly gather speed. It reminds me of a psychedelic version of the Star Wars warp/starfield effect.