Ключевые слова: average, background, best, better, billboard, black, blackboard, board, business, chalk, chalkboard, concept, customer, dirty, drawing, evaluation, excellent, executive, feedback, good, grunge, high, higher, improve, information, label, marketing, measure, old, poor, progress, score, service, sign, space, stair, staircase, success, survey, symbol, text, texture, upward, used, white, wooden, work, write, yes,