Ключевые слова: academic, alertness, book, bookshelf, campus, college, computer graphic, copy space, danger, digital generated image, door, electrical equipment, emergency sign, entrance, exit, fire alarm, information, knowledge, library, lighting equipment, literacy, literature, man made object, no people, novel, protection, safety, school, security system, sensor, sensory perception, shelf, smoke alarm, smoke detector, studio shot, study, textbook, university, white background,