This allows teachers, students, and creative people to use Sphero and Ozobot in conjunction or seperate. Put the cart on the Sphero and attach a marker to the back and then you are able to program your Sphero to move along and draw whatever you want, shapes, pictures, or even lines for the ozobot to later follow. This is a great way for students and people in general to test their programming abilities by seeing what they can program their sphero to draw or how they can maneuver their sphero so that later the ozobot can follow.