Ключевые слова: abstract, backgrounds, black, blackboard, brain, bright, bulb, color, concepts, contemplation, dark, descriptive, design, efficiency, electricity, elegance, energy, equipment, filament, generated, glass, head, icons, illuminated, illustration, image, imagination, innovation, inspiration, invention, isolated, kilowatt, lamp, light, luminosity, nobody, power, shadow, shiny, single, solution, style, symbol, technology, watts,