You've got to watch this demo for DirectX 11, created by PC modder Keilany Hayssam. It's absolutely insane, because what you are watching was being rendered in real time! There was a time when it would take a few days to render something like this, so to see it happening in real time is kind of mind-blowing. Along with the Direct X 11 hardware, he was using a Radeon 5870 and an Intel Core i7-based PC. Check this out!