Ключевые слова: art, background, blackboard, bright, bulb, chalk, chalkboard, class, classroom, closeup, cloud, concept, conceptual, creative, creativity, discovery, draw, drawn, education, electricity, energy, fluorescent, idea, imagination, innovation, inspiration, intelligence, invention, lamp, light, light bulb, nobody, problem, school, sign, solution, solve, speech, symbol, technology, text, think, wooden, word, yellow,