This poem tells the truth of playing the piano: the production of a piece of music can not be completed by a piano or fingers, but also requires people's thoughts, feelings and technical proficiency. The piano is not difficult to master. Everyone has fingers. However, due to the great differences in people's thoughts, feelings and playing skills, is the music played pleasing to the ear?
Ears are very different. Two questions are used in the poem to arouse readers' thinking. In fact, this is a complex aesthetic problem: the main cause of artistic beauty.
Objective relationship.