Ключевые слова: abstract, backdrop, background, beautiful, black, business, close, closeup, cog, cogs, cogwheel, concept, conceptual, cooperation, design, engine, engineering, factory, gear, gearbox, gears, grey, industrial, industry, machine, macro, mechanical, mechanics, mechanism, metal, motorcycle, part, parts, steel, team, teamwork, teeth, up, wheel, wheels, work,