Ключевые слова: art, background, billboard, black, blackboard, blank, board, border, chalk, chalkboard, class, classroom, college, communication, concept, drawing, education, elementary, empty, frame, green, grunge, horizontal, illustration, isolated, learn, learning, lesson, message, note, notice, old, primary, remember, remind, reminder, render, rooms, school, study, teach, teacher, text, texture, university, white, wood, wooden, write,