Ключевые слова: art, background, blue, book, bookstore, collection, color, contour, design, dictionary, document, education, element, encyclopedia, flat, icon, illustration, information, isolated, knowledge, learning, library, line, linear, lineart, literature, magazine, novel, open, outline, page, paper, pictogram, publish, publishing, read, reading, school, shape, sign, silhouette, simple, study, studying, symbol, text, textbook, university, web,