Wonderful music is an organic whole, which is composed of several parts and elements that influence and restrict each other. In music and piano sound, fingers, piano, players' thoughts and feelings, playing skills and other parts and elements are interdependent and indispensable, influencing and restricting each other, and there is a close relationship. According to materialist dialectics, the fundamental content of universal connection is the connection between the parties to the internal contradictions of things and between things. So what this song reveals is the contradictory relationship between piano, fingers and piano sound. If the players are included, then the relationship between the players' thoughts, feelings and skills and the piano and fingers can be regarded as the relationship between the internal contradictions (internal causes) and external contradictions (external causes) of things. The former is the basis of music production, and the latter is the condition of music production, both of which are indispensable.
Taking the pond as a metaphor, it shows that learning should constantly accumulate and absorb new nutrients. Everything is moving, changing and developing, and everything can maintain its existence only in movement. It is this uninterrupted movement, change and development that makes things exist in constant self-renewal. Once this movement stops, things can't exist. If there is no constant renewal and accumulation of knowledge, one's knowledge will become a stagnant pool, lifeless and without progress. Learning is like this, and so is doing other things.