Ключевые слова: abstract, advertising, art, billboard, blackboard, blue, board, border, chalk, chalkboard, class, color, concept, copyspace, crayon, creativity, design, detail, dirty, drawing, education, element, empty, frame, grunge, horizontal, idea, information, learning, lesson, line, material, message, nobody, noticeboard, object, paint, pattern, picture, scratched, slate board, smudged, space, surface, texture, used, wall, weathered, write,