Bo Le was a famous expert in the physiognomy of horses in ancient China. His book On the Physiognomy of Horses was a classic piece of work on that subject.

Bo Le had a son who wanted to learn his father's special skill and knowledge. He read the book On the Physiognomy of Horses over and over again. Whenever he went out, he would carry the book with him, and as soon as he saw a horse, he would take out the book, and compare the horse with the drawings of various horses in the book one by one.

"If you look for a steed with the aid of drawings, how can you find a really fine one?"

One day, he finally found a horse which looked similar to the drawing in the book. He led it home to his father, but it turned out to be an inferior horse of fiery temperament, and not a good steed which could gallop 1, 000 li a day. Bo Le said to his son: