Dancing Haloween Ghosts (using lego mindstorms)

this instructables will have two main parts. the first is making the ghosts and the second is making the robot and rigging the ghosts to "dance". The project is simple but it may take a lot of trail and error to get the ghosts' movement to match the beat of your chosen song. you can also just make the ghosts without the robotic parts if  you do not have a mind-storms set available to you.

Step 1: Materials

fabric ghost:
     -scraps of organza fabric (any white fabric would work but organza look more "ghostly")
     -cotton balls
     -fishing line or thicker thread
     -somewhere to mount a hook up high
     -a hook
      -a safety pin
Dancing mechanism:
     -a Lego mind-storms motor
     -some random Lego pieces (a list will be shown later)
     -some more fishing line or thread
     -zip ties
     -Mind-storms logic brick
     - a computer with mind-storms program writer
     - a place to mount the mechanism