Sometimes, a concept car is kind of a rough sketch for an eventual production model. And sometimes a concept car guides an entire industry into the future, as was the case with the Buick Y-Job ...

Better still, it's a coupe -- no Dodge Charger-style door growth here. The Riviera is being called a "global" concept that showcases Buick's future ... Riviera's apparent 2+2 interior layout.