What's the point of concept cars?

BBC News 

Concept cars look beautiful and futuristic, but why do manufacturers spend millions developing them if they're never going to make it into production? Take, for example, the DS X e-tense, a "2035 dream car" produced by the French luxury brand DS. Half open-topped sports car, half luxury saloon, its outlandish styling looks as though it has come straight from the pages of a superhero magazine. It is designed to show what the company thinks a hugely powerful, all-electric self-driving machine might actually be like. It bears little relation to anything the brand currently produces, but that is hardly the point.