Yesterday, I found out about this device called the Theramin. It is a musical instrument which you play by waving your hands around the antenna. What this means is that musically, you become the master of your own density. There is all sort of information regarding the invention of it which again is interesting as it was the offspring of some kind of Soviet spy thing years ago. It would probably take around an hour to make one of these, given by the diagrams I have seen widely available online. Cool thing.