realistic photo of a modern lecture hall, empty chairs arranged in rows leading toward a central stage, low angle view, large screen on the stage showing a close-up of a human smile, dental seminar atmosphere, the main color palette is turquoise #00859B, with accents of purple #6D0087, soft ambient lighting, clean and professional design, no people, no neon or cyberpunk elements, no futuristic details, business-style setting. No cyberpunk, no neon lights, no futuristic, no 3D, no sci-fi, no low See more