How about drawing in air too?

     For many many years lots of other mediums other than paper were introduced to art, be it crazy or rational . And now another one will be introduced: AIR. Actually it's just a part of the overall medium. So, how can somehing be drawn in the air? It will be probably not what you're thinking: It will be able to be done with a soon-to-be-going-into-the-market product 3Doodler. It's basically a 3D printing pen that have melted plastic inside. As you draw the plastic comes out from the pen , and with a integrated fan inside to cool the plastic, the plastic becomes hard and stays according to what and how you draw. It looks fun, and most probably can be very useful at some design branches. If it really comes out I think I will buy one :)
And here is a demonstration video: