Ключевые слова: back to school, book, certificate, closeup, communication, copy space, desk, diploma, education, glass material, global, global communications, globe navigational equipment, graduation, group of objects, hardcover book, ideas, indoors, information medium, learning, literature, map, no people, physical geography, publication, reading, research, science, selective focus, shiny, sphere, stack, tassel, textbook, university, wisdom, world map,