Ключевые слова: abstract, advertising, backdrop, background, billboard, black, blackboard, blank, board, chalk, chalkboard, class, classroom, close, closeup, communication, concept, copy, dark, decoration, design, drawing, education, element, empty, frame, graphic, grunge, illustration, isolated, macro, nobody, old, pattern, people, red, rubbed, school, sign, space, surface, symbol, text, texture, textured, wall, wallpaper, white, wood, write,