Ключевые слова: adult, attention, audience, blur, board, business, businessman, businesspeople, chair, classroom, conference, convention, corporate, display, education, event, hall, indoors, interior, job, learn, management, many, meeting, people, performance, person, presentation, projection, public, raise, rear, room, screen, seat, seminar, session, sharing, sit, speaker, speech, stage, study, success, training, workshop,