What does blind and ignorant Mount Tai mean?

Taishan ignorant Taishan refers to a person, and Luban has a disciple named "Taishan". The phrase "ignorance of Mount Tai" usually means that you are too superficial to see the superficial phenomenon, but you can't see the inner skills. Mount Tai here does not refer to Mount Tai, the "head of five mountains" in Tai 'an, Shandong Province, but to a person. According to records, Lu Ban, a famous carpenter in the Spring and Autumn Period, once recruited a group of students in order to develop his craft. Lu Ban is very strict with his disciples, even if there are any mistakes and flaws, he will criticize them. Of course, Lu Ban also tried his best to impart his knowledge to his disciples without reservation. Every once in a while, Luban will eliminate some "unworthy" students for fear that others will laugh at the poor skills of the students he teaches. Luban had a disciple named Taishan. He never concentrated on the carpentry skills taught by Lu Ban, but always taught himself some carving skills. Therefore, Lu Ban thought he was ignorant and was expelled from his old school. Later, Lu Ban went to the market and saw someone selling furniture. This piece of furniture is exquisitely carved and exquisitely crafted. Luban appreciated it, so he wanted to find out who did it, and then to find out. After asking, Lu Ban was surprised. It turned out that this furniture maker was his dismissed disciple "Taishan". So Lu Ban sighed, "I really don't know Mount Tai"!