Ключевые слова: abstract, audience, auditorium, black, business, chair, chairs, concept, conference, education, empty, event, gray, group, interior, lecture, line, listeners, literacy, lot, many, meeting, modern, office, pattern, performance, perspective, plastic, portable, preparation, presentation, public, row, rows, seat, seats, seminar, several, show, sit, sitting, student, training, view,