flying post-it note birds

This is my first solo attempt at kinetic sculpture.  I downloaded a lesson plan from the internet that aimed to teach kids about cams and simple mechanisms that utilize cams. I pretty much built what a 3rd grader would have built in class, using a card board box, wood dowels, foam core, spray paint, 2 Post-it notes and hot glue.  My goal is to make Post-it notes fly (ie bob up and down very fast). More specifically, I would like to make one machine (or bird) for each of the five different brain waves that occur in our brains during various activities, and represent that brain waves' frequency and amplitude with the up-and-down height and speed of each little yellow thought.  It's a very crude model, but it's the beginning of something I think is going to be really cool...