"Ruzi Niu" is an allusion recorded in "Zuo Zhuan": in the Spring and Autumn Period, Qi Jinggong played with his son, Jing Gong talked about the rope as a cow and let his son ride away. The story of "Aizi" has been celebrated through the ages. The products are: several pieces of wood, DIY instructions and tools. The finished product is completed by father and son, and the fun of DIY is experienced. When the child grows up, it will be a beautiful memory, memorable and unique.