I think because it was originally done English paper pieced...correct me if I am wrong on that. There are now several ways to do it hand pieced or even machine pieced. I have done one using freezer paper and then hand working, but I have recently seen a machine method that I am going to try...maybe just a tablerunner this time. In my lifetime only one GFG...to many other patterns to try....it was great as a take along to anywhere project, but it did take over a yr to finish piecing..that was a challenge to myself.....