Main subject: Dark glass curtain wall skyscraper, building windows and lights lit up to form the shape of "51", with urban building background. Scene: Nighttime urban building night view, creating an atmosphere of paying tribute to hardworking people for May Day. Style: Modern urban minimalist poster, light art creative design. Color tone: Deep cool base color of the building, paired with warm yellow lights, strong contrast between cold and warm. Light and shadow: Quiet dark night scene, transparent and eye-catching window lights, strong atmosphere. Composition: Building as the right visual focus, lighting numbers highlight the theme, simple and grand picture. Usage: May Day corporate holiday promotion, urban public service advertisement, workplace culture promotion material.