Watch Online Free on Watchseries. Nocturnal Butterflies is Servais' serene and melancholic homage to Belgian surrealist Paul Delvaux (1897-1994), whose architectural paintings serve as the basis for the mise-en-scène for the film, and whose opaquely gazed women represent the enigmatic, silent witnesses who guard the secrets of the eccentric artist's curious world of precisely rendered, hermetic construction.