Ключевые слова: accessibility, advice, angle, background, books, bookstore, color, contemporary, correspondence, cover, data, document, education, group, hardcover, heap, horizontal, image, information, learning, literary, literature, low, medium, nobody, novel, objects, on, open, opening, page, paper, pile, publication, reading, shot, sparse, stack, stacking, studio, studying, text, textbook, vertical, view, white, writing,