Ключевые слова: abstract, adult, asian, audience, auditorium, background, blur, blurred, board, business, businessman, class, classroom, collaboration, concept, conference, convention, cooperation, corporate, crowd, defocused, discussion, diverse, education, event, exhibition, group, hall, information, knowledge, listening, men, office, people, presentation, professional, public, room, seminar, sitting, speaker, speech, standing, talking, team, teamwork, training, women, worker, young,