The document discusses the differences between lighting for art, circus performances, and retail settings. For art lighting, the goal is to allow the artwork to be viewed as the artist intended without adding artistic elements from the lighting. In circus lighting, the lighting plays a more active role in enhancing each performance and using colors and effects that relate to the themes of different acts. Retail lighting similarly shows off products but also increasingly uses colors and effects to influence mood and create an artistic atmosphere that promotes sales.