There was a king who gave his daughter a beautiful diamond necklace. The necklace was missing and people in the kingdom searched everywhere but could not find it.
So the king put up notices, saying that anyone who found it could get a box of gold coins.
One day, a young man was walking along a river when he saw something shining in the river. When he looked, he saw the diamond necklace. He decided to catch it to get the reward（报酬）.
He put his hand in the river and tried to catch the necklace, but missed it. He took his hand out and looked again. The necklace was still there. He tried again. But strangely, he still missed the necklace! He started walking away, feeling sad. Just then, an old man walking by saw him, and asked him what was the matter.
The young man didn't want to share the secret with him, thinking he might take the necklace for himself, so he refused to tell him anything. The old man could see the young man was in trouble, He asked the young man to tell him the problem again and promised that he would not tell anyone about it. The young man finally told him about the necklace and how he tried hard to catch it, but kept failing.
The old man then told him that perhaps he should try looking upward, toward the tree, instead of in the river. The young man looked up, and the necklace was hanging on the branch of a tree. He had been trying to catch a reflection（倒影）of the necklace all the time.
