Ключевые слова: 3d, background, blackboard, blank, board, book, chair, chalkboard, class, classroom, cognition, college, design, desk, education, elementary, empty, exam, floor, furniture, hall, illustration, indoor, inside, interior, learn, learning, lecture, lesson, modern, nobody, room, school, seat, seminar, space, student, study, studying, table, teacher, teaching, threedimensional, training, university, wall, white, window, wood, wooden,