A library of composition materials that are not good at thinking and observing

Once upon a time, there was a man named A Niu who was very good at drawing sheep. He played a joke when he learned to draw sheep in his early years. Once, he took a photo of himself "shooting sheep" and showed it to a shepherd boy. The shepherd boy couldn't help laughing after seeing it. A Niu asked him why he was laughing. The shepherd boy said, "When sheep fight, all their strength is spent in the corner. The sheep's tail is caught in the ass. How can it swing from side to side? " A Niu felt very ashamed. In order to fully show the wildness of sheep fighting, in the following period of time, he deliberately observed the various modal habits of sheep repeatedly and carefully, and then made a picture of sheep fighting, which was successful. The story of A Niu's modesty, studiousness and careful observation is also widely known.