The end result of this tutorial reminds me very much of my childhood games on Playstation. 2D texture maps that looked 3D. Learning normals maps has been really quite interesting. Its quite ingenious how this process works! Baking a high res model and then turning it into a texture to stick on top of the low res model (at least this is how I understand it.) You can quite clearly see evidence of this in the third image with the riveted anchor plate. Its really quite clever!