The Blue Period (Spanish: Período Azul) comprises the works produced by Spanish painter Pablo Picasso between 1901 and 1904. During this time, Picasso painted essentially monochromatic paintings in shades of blue and blue-green, only occasionally warmed by other colors. These sombre works, inspired by Spain and painted in Barcelona and Paris, are now some of his most popular works, although he had difficulty selling them at the time.