Yesterday, I made vibrational robots with Ben, Katerina, Nicolas, and I. They were a fan that lit up and it was run on a 9v battery. Then we put highlighters on it with rubber bands. After that we cut off 3 of the blades on the fan to make it wobble. Finally, we took the caps off the highlighters, put it on paper, and turn it on. The fan vibrated and moved and a it moved it drew stuff. Pretty cool.