Ключевые слова: advertising, background, black, black board, blackboard, board, business, buy, chalk, chalkboard, challenge, child, college, commerce, communication, concept, creativity, customer, design, draw, drawing, education, event, handwriting, handwritten, information, isolated, knowledge, lettering, market, marketing, message, note, online, presentation, product, sale, school, sign, strategy, success, symbol, text, texture, trend, university, white, word, write, written,