Image Before	Image After (exaggerated for effect)

Now I'll admit this has probably already been thought of, and I think the effect was actually visible in older games, but my point is that need to do it better. In the example shown here, the back of the tower (with the fan blades) is apparently rendered at the same level of clarity as the front of the tower (the side facing you, the viewer). So the far-off tower is fuzzy; great. (And the shadows help a lot.) But let's add some depth even to things relatively close to you!