Ключевые слова: alternative, art, barrel, bio, building, burn, business, canister, contour, diesel, drilling, eco, ecology, energy, environment, factory, fire, flame, fuel, gas, gasoline, glowing, icon, illustration, industrial, industry, isolated, leaf, light, lighter, line, linear, lineart, neon, object, oil, outline, petroleum, pipe, power, production, pump, recycle, refinery, rig, silhouette, smoke, technology, tool,