Ключевые слова: absence, abstract, back, back to school, blackboard, business, campus, chair, class, classroom, cognition, college, color image, concept, conference, design, desk, education, elementary, empty, equipment, floor, furniture, hall, high school, horizontal, indoor, inside, intelligence, interior, learning, lecture, lesson, light, no people, presentation, primary, room, school, seat, seminar, student, study, teaching, university, wood,