Primary subject matter of sculptor Dan Flavin?

Dan Flavin was primarily known for his work with fluorescent light, transforming simple industrial materials into evocative sculptures that explored concepts of space, perception, and color. His installations often utilized the interplay of light and shadow, creating immersive environments that challenged traditional notions of sculpture. Flavin's minimalist approach emphasized the qualities of light itself, making it a central element of his artistic expression. Through his innovative use of light, he sought to redefine the boundaries of sculpture and engage viewers in a unique sensory experience.