Ключевые слова: abstract, advertisement, background, billboard, black, blackboard, blank, board, chalk, chalkboard, childhood, class, classroom, college, communication, concept, copy, design, dirty, drawing, education, empty, frame, green, grunge, horizontal, learn, lesson, message, note, old, pattern, retro, school, scratch, sign, space, student, study, surface, teach, text, textured, used, vintage, wall, wood, wooden, write,