Let me tell you a story about a bestseller: On a certain day of a certain year, I bought a bestseller and spent a long time studying this book, which was as thick as a dictionary and was heavily promoted by a publishing house that year. After studying it for a long time, I didn't find out what else the book could be used for other than as toilet paper. So I kept the book. Later, my 9-year-old cousin found out the reason why this book became a bestseller. This thick "book" was indeed a good material for making paper cuttings and origami.