Ключевые слова: abstract, aged, ancient, antique, backdrop, background, black, blank, book, brown, closeup, color, concept, concepts, cover, design, document, education, frame, grain, grunge, hardcover, history, image, information, knowledge, learning, library, literature, manuscript, material, object, old, open, page, pages, paper, pattern, retro, school, science, stack, study, surface, text, textbook, textured, textures, university, vintage, white, wooden,