Ключевые слова: abstract, advertisement, advertising, background, backgrounds, billboard, black, black and white, blackboard, blank, board, bulletin, canvas, chalkboard, class, classroom, close, closeup, communication, copy space, design background, design element, detail, distressed, education, empty, grunge, grunge background, grungy, horizontal, indoor, information, inside, learn, lesson, macro, message, nobody, notice, noticeboard, photo, photograph, rubbed, school, surface, teach, texture, textured, textures, white,