designer's own words:only a minimum amount of energy is needed to produce the new renault 4. reduced complexity of the car with minimised number of parts requires a short and low energy assembly line. there is no need for heavy body stamping machinery as the body is formed and glued over basic templates. the simplified design allows short engineering and development time. additionally it allows quick re-engineering for specific markets, design updates or even customer created design variants. retro-fitting and upgrading to the latest power trains and latest energy storage solutions and newest digital/interaction technologies is made easy. as is dissasembly for recycling.