Use the slider to adjust the speed of the balls. Click on a ball to highlight (or un-highlight) it. Click the background to show or hide the paths the balls follow.
These balls appear to move in a circle, but in fact each one is moving back and forth in a straight line. By reducing the speed, having the paths visible and highlighting a ball this can be seen clearly. This project was made very quickly for fun, it's unlikely that you'll see many more projects from me.
