Ключевые слова: background, book, chapter, cognition, detail, document, education, eyeglass, eyewear, font, glass, glasses, goggles, head, horizontal, information, learn, learning, letter, letters, library, lifestyle, line, literature, material, no people, novel, object, open, open book, optical, page, paper, print, read, reading, shackle, shadow, spectacle, stitch, story, studying, subject, surface, text, textbook, transparent, white, white background, wisdom,