If You’ve examine the part higher than about steel foil stamping, the process will probably be easy to image. From the stack of products: your cover on The underside. Previously mentioned it the (optional) foil and after that the metallic stamp (die) which has a reversed version of the style https://cartooncharactersdesign.blogspot.com/2024/09/a-book-cover-design-can-make-difference.html