A really detailed model usually has a lot of polygons. It looks nice but it's tough on computers to process. This lesson shows another use of textures and mapping. Here the detailed model on the left is used to create a map that tells the program how light should bounce off its surface. This map is then placed onto the low resolution model in the middle and you end up with something like you see on the right. It has the same small amount of polygons but with this extra layer of information, it looks a lot better while being easy for the computer to handle. This lesson was more about showing me what was possible since most of it is over my head at the moment.