An activity that keeps children busy while adults focus on "real life" is the impression people had of digital painting before. But in recent years, with the development of Paint by Numbers, painting itself has gradually evolved into a way to relieve stress. Today's adult paint by numbers books are rich and diverse, including customized paint by numbers series, flower series, animal series, etc. Each pattern is full of artistic sense and creative space to meet the aesthetics and interests of different people. More and more adults are picking up their brushes again and investing in painting.