Ключевые слова: backdrop, blank, board, boardroom, brainstorming, business, classroom, company, conference, day, discussion, displaying, education, empty, equipment, frame, hall, horizontal, indoors, information, interior, isolated, large, lecture, meeting, modern, movie, multimedia, nobody, office, planning, present, presentation, projection, projector, reflection, room, screen, seminar, student, study, table, teacher, urban, visual, wall, white, window, writing,