Ключевые слова: audience, auditorium, back, background, blur, bokeh, business, cinema, classroom, concert, conference, congress, convention, corporate, crowd, education, entertainment, event, group, hall, head, house, lecture, light, meeting, movie, participants, people, performance, play, presentation, public, room, row, screen, seat, seminar, show, sitting, speaker, spectator, speech, stage, theater, theatre, theatrical, training, viewer, watching,