Ключевые слова: anonymous, attention, audience, auditorium, back view, blur, briefing, business, conference, contemporary, convention, course, dark, development, dim, economy, education, event, faceless, financial, forum, hall, horizontal, indoors, information, innovation, lecture, listen, meeting, modern, obscure, participant, people, presentation, public, seat, seminar, silhouette, speaker, speech, stage, strategy, team, unrecognizable,