Xiaozai is a 4-and-a-half-year-old boy with some innate sense of order. For example, when collecting building blocks, you should put the patterned side up; When you go to the early education center, you will take apart your own toy combinations and put them in storage boxes in different categories; I also worked as a "librarian" in kindergarten, urging other children to put their books back. But most of the time, like children of the same age, he throws toy books around the house and cries when he can't find them. When he was two years old, I also tried to classify his toys and put up pictures. But at that time, he was more interested in labels than classification, and soon tore up all the pictures. This time, since children's toys have reached an order of magnitude, the space I reserved in advance is not enough. On weekends, I led him to have a big toy arrangement. Let's take all the toys out and pile them on the mat, and then you can judge which toys are not needed, which toys to play now and which toys not to play for the time being. We throw away the toys we don't want, put the toys we don't play for the time being in the small room, and put the toys we want to play with on the toy shelf. She will tidy up her toys for the rest of her life.