The Paris Motor Show is underway, and concepts are being shown off all over the place. Ford is showing off an unexpected concept vehicle – the isosis X. This is a crossover concept vehicle that builds on the isosis sedan concept that Ford unveiled at the Frankfurt show last year. The isosis X is purely a show car, but Ford says that it will form the basis for a production vehicle that could appear within two years. The coolest feature of the isosis X? It has a glass floor, so you can see the road fly by under you as your drive.