Ключевые слова: announcement, art, artwork, background, billboard, black, blackboard, blank, board, business, chalk, chalkboard, class, classroom, college, communication, concept, copy, design, display, drawing, easel, education, empty, frame, front, grunge, learning, lecture, lesson, menu, message, object, poster, presentation, reminder, school, sign, space, stand, study, teach, texture, tripod, white, wood, wooden, write,