And a lot of times I was, honestly, too lazy to learn how to read the notes and play the notes, so I would play by ear, I would just listen to something and then I would try to play it back myself.
For me, the driving force is that there's always something new to try a new problem, a new subject, a new shape that I didn't think I was able to create before but now I think I know how to realize it.
One theory is that it is a spy plane, designed to catch savvy targets that know how to go to ground when spy satellites—which have predictable orbits—are overhead.