How does a Mitsubishi Lancer CVT invecs transmission work?

In the Lancer CVT transmision there are to simplify things a series of "belts" that allow the transmision to vary the gear ratio based on the vehicle's needs. For example, if the driver accelerates quickly it will switch through the gears and keep RPMs high as you accelerate to maximum speed; conversely if the driver accelerates slowly it will maintain low end torque to and keep RPM in the medium range to maximize fuel economy.