Laboratory hanging industry is good at hard work and successful at calligraphy and painting. Good work comes from hard work, but waste comes from playfulness. Actions are accomplished by thinking, destroyed by following. Study is due to hard work and specialization, and due to play is wasted. Virtue is achieved by independent thinking and corrupted by following the custom. This sentence comes from Han Yu's "Jinxuejie", which means that studies can be mastered due to diligence, but they can be wasted in games. Things are successful because of repeated thinking, but they can be destroyed by randomness without thinking. A calligraphy work titled "Excellence in Industry Comes from Diligence" is hung in the laboratory. It is not only inspiring, but also creates a positive working atmosphere in the office.