Once upon a time, there was a boy named Tim. Tim loved to paint. He would paint all day long. He painted on paper, on walls, and even on his clothes. One day, Tim found a sack in his room. He had an idea. He would paint the sack!
Tim painted the sack with many colors. He painted a sun, a tree, and a big happy face. He was very proud of his work. But when his mom saw the painted sack, she was not happy. She told Tim that he should not paint on things that were not for painting. Tim felt ashamed.
From that day on, Tim only painted on paper and things that were okay to paint. He learned his lesson and never painted on a sack again. And even though he felt ashamed before, he knew that he could still be a great painter by following the rules.
