Ключевые слова: billboard, business, chart, concept, conference, demonstration, design, display, draw, drawing, drawn, education, equipment, flat, graph, graphic, hand drawn, icon, illustration, isolated, lecture, line, linear, meeting, mobile, modern, office, outline, pie, placard, poster, presentation, progress, projection, projector, roll, roller, screen, seminar, show, showing, slide, stand, teaching, visual,