Ключевые слова: abstract, ad, advertisement, advertising, announcement, backdrop, background, billboard, black, blackboard, blank, blue, board, canvas, chalk, chalkboard, classroom, close, closeup, communication, copy, copyspace, dark, design, dirty, drawing, education, element, empty, frame, grunge, grungy, horizontal, learning, message, nobody, old, pattern, rubbed, school, scratch, smudged, space, surface, texture, textured, vintage, wall, white, write,