Every year car manufacturers and designers dream up a string of super-cool concept cars to test public reaction and show off their skills. Very few concepts actually make it on to our roads, but there are always some exceptions. Often the technology and design elements used on concept cars are also adopted for use on vehicles that do actually make it on to production lines. Usually concept cars are created by the car firms themselves, but sometimes individual agencies or designers not affiliated with the brands have a go to make a name for themselves. Here we look at the ten coolest concept cars envisaged in recent years.