Ключевые слова: anonymous, attention, audience, auditorium, blur, briefing, business, chair, coach, conference, contemporary, convention, course, crowd, development, economy, education, event, financial, forum, hall, horizontal, illuminate, indoors, information, innovation, learn, lecture, lesson, listen, meeting, modern, participant, people, presentation, public, seat, seminar, speaker, speech, stage, teach, training, tutor, unrecognizable,