We want to calculate which affirmative place a certain small steel pill will to fall into after collide with the stumbling-stake, is difficult； But which possible place ( Or calculate:“how much does possibility of a lot of small steel pills appear at a certain place？”), is not difficult； In this exhibit, because of the place of each narrow slot is dissimilar, make the amount of the possibility of each narrow slot that a certain small steel pill will to fall into also is different. Obviously, the possibility of the narrow slot near the exhibit middle that the small steel pill will to falls into is larger . Result in: A lot of small steel pills falls into the narrow slot of underneath the exhibit after collide with the stumbling-stake again and again finally , becoming the shape of the bow( the clock form).
Turn over the frame install in the exhibit shelf, a great deal of small steel pills would come down in torrents from export. In the process of fall,it will be random that each small steel pill falls into which the narrow slots after collide with the stumbling-stake again and again finally, but the distributing probability of small steel pills in narrow slots matches the “Gauss distributing curve”.