Ключевые слова: analysis, background, blackboard, blank, board, business, chart, class, classroom, color, concept, data, design, diagram, display, easel, education, element, finance, flat, flip, flipchart, frame, graph, icon, information, isolated, learn, lecture, lesson, office, presentation, projection, sales, school, screen, seminar, show, slide, stand, success, symbol, teach, training, tripod, university, web, white, whiteboard,