Ключевые слова: background, black, blackboard, blank, board, bulletin, business, can, chalk, chalkboard, child, color, concept, drawing, education, encouragement, evidence, fill, filling, hand, handwriting, help, i, idea, inspiration, letter, motivation, motivational, optimism, phrase, positive, proof, script, sign, sketch, slogan, success, text, white, word, write, written,