Ключевые слова: anonymous, audience, background, blur, blurred, business, businessman, busy, campaign, celebration, concert, conference, congress, convention, corporate, crowd, crowded, delegates, diversity, education, entertainment, event, festival, forum, group, hall, human, indoors, lecture, manager, many, men, music, outside, overcrowded, overpopulation, participants, passenger, pedestrians, people, person, population, presentation, seminar, spectator, training, transportation, visitor, walk, women,