What kind of beauty is written in the cool, bright and crisp children's songs of childhood?

The Beauty of Sound

"The Mud of Childhood" writes about the "three beauties": white teeth, dark skin, and red clay whistle. This is the beauty of color; blowing the mud whistle, The nursery rhymes are clear and crisp, which is the beauty of the sound; "adding infinite vitality to the silent fields in autumn", this is the beauty of the harmony between man and nature.