You take all of your thread and allocate them into one place to unite them. You wrap all the thread together into a giant thread ball. Now it's a big, united mess!
You're busy trying to unite all of your thread, twisting and tying and wrapping, and suddenly you look at the ball in your hands and see とうきょう. You've united this thread into the shape of とうきょう. There are even little pins for all the famous neighborhoods and tourist spots. This is strange, because you don't remember putting them there.