Ключевые слова: academic, achievement, backlight, blackboard, chalk, children, classroom, classroom activity, collaboration, college, communication, cooperation, curiosity, dark, education, educational, fingers, gray, grayscale, group work, hands, indoors, information, inquiry, knowledge, learning, learning process, lesson, question, retro, school, school supplies, student life, students, study, success, teach, teacher, teamwork, university, vintage, window, writing,