Our Inventions and Their Inventions is a set of popular science picture books introducing the encounter and exchange of ancient Chinese and Western civilizations. It traces the birth process of the great inventions in history and their influence on the civilization process, and uses the contrast between the East and the West to show the convergence and collision of human civilizations. While cultivating children's national self-confidence and pride, it also broadens their horizons and encourages them to look at the historical process and future development of human civilization with an open, humble and tolerant mind. The series consists of 5 volumes, the themes of which are "gunpowder", "compass", "silk", "iron" and "clock"."The Clock" introduces the invention, use, and dissemination process of clocks and watches with both pictures and texts.