Ключевые слова: black, blackboard, board, brain, brainstorming, bulb, chalk, chalk board, chalk drawing, chalkboard, color, concept, conceptual, creative, creativity, dirty, education, electric, eureka, front, full frame, hand drawn, handwriting, icon, idea, illumination, illustration, image, imagination, innovation, inspiration, intelligence, invention, lamp, light, light bulb, lightbulb, metaphor, nobody, picture, power, school, science, sign, solution, symbol, text, think, view, word,