Ключевые слова: advert, advertisement, advertising, background, billboard, black, blackboard, blank, board, business, chalk, chalkboard, class, classroom, clean, concept, copy, copyspace, draw, drawing, educate, education, empty, frame, horizontal, isolated, kid, learn, message, nobody, note, object, presentation, retro, school, schooling, sign, space, straight, symbol, teach, teacher, text, texture, white, wood, wooden, word, work, write,