Introduction to "The No. 1 Stone in Qian'an": There is almost no stone produced in Qian'an, so this big stone in the courtyard is known as the "No. 1 Stone in Qian'an". This stone weighs one and a half tons, but it was found in a "big sauce jar" that would sink if people and animals fell into it. After many years, this ton-heavy stone has not sunk, which is quite mysterious.