Move around your mouse to swirl around the particles. They'll interact with each other if you watch carefully, but they all bounce off the edge. Note: It might lag a bit when you first start, but as long as you have a decent computer you should be able to use it well. Love and favorite if you like it!
All by me. I completely used cloning. 9/23/14 CURATED!!! Thanks @ClareBear202 See one of my other project, -Ethereal- http://scratch.mit.edu/projects/25267930/ Inspiration from @-TheDoctor-