How to explain the meaning of calligraphy to children?

Calligraphy relies on the flexibility of brush movement and the richness of ink on Xuan paper, leaving ink and spots and forming meaningful black and white composition on paper, so calligraphy is the art of composition; The calligrapher's pen is an extension of his finger. The galloping, slowness, flying and frustration of the pen are all driven by subjectivity and become the vent of his emotions. Therefore, calligraphy is an art of expression; Booksellers can quietly reflect their personal life feelings, knowledge, cultivation and personality through their own works, so there is usually a saying that "books are like people, and books are paintings of the heart".