My first inclination would have been to solve this sort of stuff by digital manipulation. But on second thought, once built, it's a static piece of hardware th

My first inclination would have been to solve this sort of stuff by digital manipulation. But on second thought, once built, it's a static piece of hardware that essential does a single compose-able image transformation that requires no processing power--almost like a pre-processor. It just doesn't handle the requirement if the transformation has to change from moment to moment.