東山文化, or Tōzan Bunka, refers to a cultural movement that emerged during the late Muromachi period in Japan, around the 15th to 16th centuries. It is characterized by its emphasis on the aesthetics of simplicity and elegance, often reflected in the practices of tea ceremonies, poetry, and garden design. This cultural wave represents a shift towards refined expressions of beauty and tranquility, deeply influencing traditional Japanese arts and social customs.