Ключевые слова: analysis, art, background, billboard, black, blackboard, blank, board, business, chart, classroom, concept, design, diagram, display, education, element, empty, financial, flat, frame, graph, graphic, green, group, growing, icon, illustration, information, isolated, line, office, person, plan, presentation, projector, report, sales, school, screen, sign, simple, success, symbol, teacher, teaching, training, web, white,