Ключевые слова: 3d, app, application, background, book, bookshelf, business, character, database, device, digital, ebook, education, electronic, elibrary, icon, illustration, information, internet, isometric, knowledge, learning, library, literature, man, media, mobile, online, people, person, read, reader, reading, school, screen, smartphone, store, student, study, technology, textbook, university, web,