Prepare a piece of A4 paper, as shown in the figure; Fold in half and then fold both sides in the middle, then fold the whole body in half once. Divide into four parts and cut with a knife. Sew the cut paper together with a needle and thread. Cut the edge with a knife and draw a pattern on the outside to make a mini notebook.

I believe everyone is familiar with Da Vinci. As an outstanding talent in biology, mechanics, family studies, engineering, mathematics, painters and other fields. Leonardo da Vinci made countless contributions to his life. His manuscript has preserved more than 6000 pages so far, which not only contains various academic ideas, but also records his own life. This "all-inclusive" recording method can be regarded as the origin of handwritten accounts.