Ключевые слова: art, background, billboard, black, blackboard, blank, blue, board, chalk, chalkboard, class, classroom, clean, closeup, color, colorful, communication, concept, crayon, draw, drawing, education, empty, frame, front, green, learning, message, nobody, old, piece, pink, red, school, stick, study, surface, texture, textured, used, wall, wet, white, wooden, writing, yellow,