When a C5’s wheel hits a bump, the nitrogen is compressed and excess hydraulic fluid flows through a circuit, to a storage reservoir. The sphere at each wheel acts as its own nitrogen cushion. Just like the biological bloodstream, the hydraulic fluid flows back and forth along the circuits, damping the movements of each wheel. The C5 has such a pillowy-soft ride because its occupants are literally riding on these gas-cushions. In fact, the car has seven spheres – look closely at the video and co