Ключевые слова: advertising, background, banner, billboard, black, blackboard, blank, board, brown, chalk, chalkboard, class, classroom, communication, concept, copy, copyspace, decoration, dirty, drawing, education, empty, frame, grunge, information, isolated, lesson, message, note, old, panel, picture, placard, plank, plaque, post, retro, school, sign, space, student, study, teach, text, texture, textured, vintage, white, wood, wooden, write,