《太平广记·卷二百二十八·博戏》
古人玩投壶，只看投没投中，不看投中后能不能返跳回来。因此用小豆为筹投壶，厌恶筹箭投中壶后又返跳出来。
古之投壶，取中而不求还，故实小豆于中，恶其矢跃而出也。
When the ancients played arrow throwing, they only looked at whether the arrows were thrown in or not, and did not look at whether they could bounce back after being thrown in. Therefore, small beans were used as arrows, and it was annoying that the arrows bounced back after being thrown into the pot.