Ключевые слова: adult, audience, auditorium, back, blue, blur, business, business woman, businessman, cinema, concert, conference, congress, convention, corporate, crowd, delegates, discussion, education, entertainment, event, forum, group, hall, head, indoors, lecture, listeners, manager, meeting, men, music, participants, performance, person, presentation, professional, public, row, seminar, show, silhouette, sitting, speaker, speaking, speech, stage, teaching, training, workshop,