Ключевые слова: background, billboard, black, blackboard, blank, bright, bulb, business, chalkboard, class, classroom, concept, conceptual, copy, copyspace, creative, creativity, dark, design, education, electric, electricity, empty, energy, glowing, hang, idea, illuminated, illumination, imagination, incandescent, innovation, inspiration, intelligence, invention, lamp, light, object, power, room, school, shine, sign, solution, space, success, symbol, texture, think,