《太平广记·卷二十八·神仙二十八》
商贩让契虚闭上眼睛坐到囊中，只半天，商贩说： 你可以睁眼看着啦！ 
捀子命契虚瞑目坐橐中，仅半日。捀子曰： 师可寤而视矣。 
The merchant had Qi Xu close his eyes and sit in the knapsack. After only half a day, the merchant said, "You can open your eyes and look!"