Modern lecture hall, architectural acoustics, principles and design, PPT presentation, speaker at podium, professorial man, bespectacled, salt and pepper hair, formal attire, microphone, projector screen, audience seating, sound wave patterns, acoustic panels, ceiling treatment, diffusers, absorbers, soundproofing materials, wooden chairs, carpeted floor, minimalist interior design, natural lighting, softbox lights, 3/4 composition, shallow depth of field, educational atmosphere.