Ключевые слова: abstract, adult, audience, auditorium, background, blur, blurred, bokeh, business, classroom, college, communication, concept, conference, congress, convention, corporate, education, event, events, focus, group, hall, high, international, keynote, lecture, light, meeting, networking, office, people, person, podium, presentation, projector, public, room, school, screen, seminar, sitting, speaker, speech, students, study, teacher, team, university, white,