Is this the problem?
Have you ever eaten Lamian Noodles? If you open a dough, then fold it in half, then open it again, then fold it in half ... and so on, fold it 10 times, how many noodles will you pull out?
Solution: the tenth power of 2 = 1024 roots.
That is, there are two faces at a time, and then 10 times is like this, which is the n power of 2.
This problem is not unique, all of them can be applied to the n power of 2.