The Sleeping Gypsy Painter is a famous painting by French Post-Impressionist artist Henri Rousseau. The painting depicts a lion, sleeping gypsy woman, and a horse in a moonlit landscape. Rousseau was known for his primitive style of painting, which he developed without any formal training. He was also known for his use of bright colors and bold outlines. The painting has become an iconic image of Rousseau's work and is widely recognized as one of the most influential works of the 20th century.