Ключевые слова: architecture, audience, audiovisual, background, black, blue, blur, business, ceiling, classroom, closeup, coach, colour, computer, conference, demonstration, digital, education, entertainment, equipment, film, gray, instructor, lecture, lens, light, listening, meeting, modern, movie, multimedia, object, office, people, presentation, projection, projector, roof, room, screen, seminar, showing, slide, system, table, team, technology, video, workshop,