Ключевые слова: back, background, blue, blue background, book, class, classroom, college, colourful, concept, data, data processing, design, digital animation, digitally, digitally generated, education, generated, generated image, graphic, illustration, image, knowledge, learn, learning, lesson, montage, no people, paper, pen, pencil, processing, school, sign, student, study, studying, symbol, text, university,