It's nice to find out that tops are a thesis topic, but I must say that I was not very impressed by these....
I don't mean to criticize (I find that tops are wonderful in all of their appearances), but the only part that really awoke my interest was when the guy tried to do something with the coin, even though not successfully.
That sort of gave me an idea... Shaping the sides of the top part a bit differently, and with a bit of carving and painting, the top could become a spinning roulette!
You could put a ball, rather than a coin, in it, once thrown, and gamble on which number will come out...