Ключевые слова: abstract, adult, audience, background, blur, blurred, blurry, boardroom, bokeh, briefing, business, businessman, center, coaching, concept, conference, congress, convention, corporate, defocused, education, event, explaining, forum, gesturing, group, hall, learn, lecture, light, listening, male, man, meeting, multimedia, participants, people, person, presentation, professional, public, room, seminar, speaker, speech, student, study, teaching, training, university,