Ключевые слова: abstract, audience, auditorium, background, blue, blurred, business, chairs, coaching, color, computer, conference, congress, convention, culture, education, empty, equipment, event, group, hall, lecture, light, man, meeting, microphone, modern, new, nobody, office, over, pattern, people, podium, presentation, professional, public, room, rostrum, screen, seminar, sitting, speaker, speaking, speech, stage, table, training, tribune, university,