Ключевые слова: alternative, art, black, bulb, concept, contour, creative, design, eco, ecological, ecology, electric, electricity, energy, environment, environmental, future, global, gold, golden, graphic, green, icon, idea, illustration, innovation, isolated, lamp, leaf, light, lightbulb, line, linear, lineart, natural, nature, outline, plant, power, renewable, resource, save, sign, sustainable, symbol, technology,