The most advertised features of "Killzone 2 Behind the Bullet Demo" are time manipulation and camera control. However, I find another feature far more interesting than the rest- the visual debug modes. In other words, you can view separate visual layers and compare them side-by-side to the final composited image. The debug modes are Normals, Shininess (Specularity/Reflectivity), Lighting, No Post [-Processing] and Depth (I just wish that rigging components were included too). The fascinating thing is that you can see how different components affect the final render in real time and move the camera for more details. If you're a 3D artists, then you should definitely find a playstation and go through the Bullet Demo for educational purposes.