This work is a series of posters made for an exhibition of light and shadow art. The main visual element of the poster uses the four Song typeface characters of the exhibition's theme "Light and Shadow Time" as creative elements. After breaking down the strokes of the characters, the relationship between light and shadow is presented, forming an artistic expression form of "light and shadow interaction". This "light and shadow interaction" art form emphasizes the theme and connotation of the exhibition.