Ключевые слова: abstract, background, black, blue, business, circle, clock, clockwork, closeup, cog, cogwheel, concept, connect, cooperation, design, engine, equipment, factory, gearbox, gears, illustration, industrial, machine, macro, mechanical, metallic, motion, old, part, precision, progress, retro, rotate, shiny, steel, success, symbol, team, teamwork, technical, technology, teeth, time, transmission, watch, wheels, work,