So, each side of the diamond gets these weird triangles, which then get sewn together thusly:
This is supposed to result in a somewhat straight line. It does not. It may pull straighter once the border goes on, but I have my doubts.
I just sincerely loathe things afghan. I resent how hard it is. I resent how often the directions are just “eh, whatever.” I resent that I have to motherfucking whipstitch things together. I have to do all this piecework and sew?! Do I look like I want to be quilting?
I only hope this part goes quickly.