Having eyes but not seeing the mountains

It often describes some people who are ignorant and blind. Who knows, the Mount Tai in this idiom does not refer to the famous mountain in Shandong Province, but to a famous bamboo craftsman in ancient my country.

There is an interesting folk story here: Lu Ban, a famous carpenter in the Spring and Autumn Period of my country, often recruited apprentices. Lu Ban cherishes his reputation very much, and every once in a while, he will eliminate some "ineffective" people from his apprentices. There was a young man named Taishan among Lu Ban's apprentices. He didn't seem to be very dexterous and his skills had not improved much. In order to maintain the reputation of Ban Men, Lu Ban resolutely resigned from Taishan.

A few years later, Lu Ban and his disciples were wandering around the market, and suddenly found many exquisitely crafted bamboo furniture on the stalls. The craftsmanship had reached the level of proficiency, and customers rushed to buy them. Lu Ban, who loved talent, wanted to get acquainted with this bamboo master, so he asked people about it. People told him that it was made by the famous Taishan, Lu Ban's apprentice.

Lu Ban was shocked. Thinking of his mistake in saying goodbye to Mount Tai, he felt deeply regretful and sighed: "I really can't recognize Mount Tai!"