Ключевые слова: adults, attentive, audience, auditorium, big screen, business, conference, corporate, crowd, crowded, display, diverse, education, event, focused, gathering, group, indoors, large screen, learning, lecture, listening, men, participating, people, presentation, professional, projection, public, room, rows, screen, seats, seminar, sitting, speaker, stage, technology, training, video, watching, women,