Ключевые слова: above, back, background, banner, billboard, black, blackboard, blank, board, chalk, chalkboard, class, classroom, clean, color, communication, copy, copy space, dark, design, dirty, drawing, education, empty, flat, frame, gray, grey, learning, menu, object, old, pattern, retro, rub, school, space, study, texture, topview, wall, wallpaper, white, write,