Concept cars serve a purpose. The automakers say that it's to showcase future production models or future technologies, but in a lot of cases, their actual purpose is to make enthusiasts yearn for them to reach production. Sadly, oftentimes, they don't.
As concept cars are never confined to regulations, automakers can truly go crazy with them in just about every aspect. We've seen our fair share of cool concept cars from all over the world, and some of them really did go into production with little to no changes (see Jaguar C-X16, among others). However, most remain purely an item of the design and engineering teams' fantasies.
But what happens when French companies make a concept car? The answer is, more often than not, some properly unique stuff. Companies like Renault, Peugeot, and more are already known for rebelling against the established norms of design even in production cars, so you can imagine what happens when their design teams and engineers really let their hair down. Frankly, it's really disappointing that these French concept cars never actually made production.
One look at the Peugeot Proxima makes you wonder, why didn't CD Projekt Red just license this to appear in "Cyberpunk 2077" instead of the Porsche 911? The Proxima was introduced in 1986 at the Paris Motor Show, and it was unlike any other supercar in the world. As you can see, the most notable aspect of its design is that the rear wheels are almost entirely separated from the bodywork, each with their .