Ключевые слова: adult, audience, background, blackboard, blur, blurred, boardroom, bokeh, business, child, class, classroom, college, colorful, communication, concept, conference, corporate, diversity, education, event, fun, group, homework, information, job, kid, knowledge, learn, lecture, lesson, light, many, person, presentation, pupil, room, school, schoolchild, seminar, student, study, teacher, teaching, technology, training, university, workers, workshop, young,