Ключевые слова: 3, background, blue, blurred, book, book spine, booklet, books, bookstore, bookworm, business, cover, cyclic, defocus, design, diary, dictionary, directory, document, education, empty, falling, flying, information, isolated, knowledge, layout, levitation, library, lies, literature, note, notepad, object, packaging, pattern, planner, repetition, sample, school, seamless, seamless background, sheet, stationery, study, textbook, wallpaper, white, write down,