Pencil is round at first, and it is easy to roll on the table and break on the ground, so someone invented a hexagonal pencil to make it difficult to roll and applied for a patent. The first important invention around the pencil is the hexagonal pencil, which effectively prevents the pencil from falling off the desktop and breaking the refill. According to the records, the guy who applied for this appearance patent received a transfer fee of several hundred thousand pounds, which was an astronomical figure at that time. Hexagons are similar to circles, which are more comfortable to hold and have greater friction. Another reason is that it is not easy to roll on the table. Using space, the same box is placed in many hexagons, which is convenient for transportation. From the physical and chemical point of view, the entropy value of circular objects tends to be the maximum in nature, and man-made objects are the result of entropy reduction movement.