Children are interested in exaggerated and lovely handmade works. Paper, fruits and vegetables, dirt, sand and stones are all children's favorite handmade materials. Why? Because of their convenience, environmental protection and strong plasticity, these materials have become children's favorite "things around them". However, in recent years, many children's hand-written books have abandoned their favorite "things around them" and replaced them with all kinds of flashy operating materials. Starting from the innocent nature of children, their favorite things from beginning to end are dirty mud, sticky clay and wet sand. ...