这是一个古老的寓言故事，出自中国战国时代（公元前5世纪到2世纪）的《韩非子》，原名叫郑人买履，履就是鞋子的意思。郑人买履今天成为一个成语，用来讽刺脱离实际，一味教条的人。

This is an ancient fable from the philosopher "Han Fei Zi" in the Warring States Period (5th to 2nd century BC) in China. It has become an idiom today, used to satirize people who are out of touch with reality and blindly dogmatic.