Ключевые слова: above, advertising, announcement, antique, background, billboard, blackboard, blank, board, business, chalk, class, classroom, color, cooking, copy, dark, drawing, dust, educate, education, empty, frame, free, green, horizontal, isolated, learn, lesson, message, metal, old, pattern, presentation, red, retro, school, smudge, space, studying, surface, teach, texture, textured, vintage, wood, wooden, work, write,