Ключевые слова: academic, alertness, campus, chair, class room, college, college student, computer graphic, copy space, danger, desk, digital generated image, education, electrical equipment, emergency sign, fire alarm, higher education, knowledge, lighting equipment, man made object, no people, protection, safety, school, security system, sensor, sensory perception, smoke alarm, smoke detector, student, studio shot, table, university, university student, white background,