My mother was a piano teacher. My house was usually full of children who learn piano and also full of piano sounds that they are playing. While they are waiting for their turn for the piano, they played with a paper piano. Paper piano did not make any sounds by itself, but was no problem to children because they also pleasantly sang it while they are playing. There was a pleasant and fantastic interaction between paper piano and humming(singing) of children in my memory.

My mother was a piano teacher. My house was usually full of children who learn piano and also full of piano sounds that they are playing. While they are waiting for their turn for the piano, they played with a paper piano. Paper piano did not make any sounds by itself, but was no problem to children because they also pleasantly sang it while they are playing. There was a pleasant and fantastic interaction between paper piano and humming(singing) of children in my memory.