概率

        预测某一钢珠与障碍物碰撞后落到哪个位置是困难的，但预测它可能掉到什么位置（或一大堆钢珠在某位置出现的可能性有多少）是不难的；在展品中，由于每根狭槽所处的位置不同，使得钢珠掉落其中的可能性大小也不同。显然越是处于展品中间的狭槽，钢珠掉落其中的可能性就越大，结果就是一大堆钢珠在经过与障碍桩碰撞并掉落展品下部狭槽后呈弧状（钟形）图形。

操作方法：
       翻转方框，大量钢珠由出口下落，下落过程中多次与障碍桩随机碰撞，最终落入下槽，但分布机率符合正态分布曲线(又称“高斯分布”曲线)。    

Probability

        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).

Operation method: 
        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”.