Ключевые слова: abstract, advertising, art, background, black, blackboard, blank, board, brick, chalk, chalkboard, class, classroom, closeup, communication, cool, copy, dark, design, dirty, drawing, education, empty, frame, graphic, gray, grunge, horizontal, learning, material, message, modern, old, paper, pattern, retro, rough, school, space, surface, symbol, texture, textured, vintage, wall, wallpaper, white,