You don't flip the corners or the middle of the block at this end stage. You flip the 2 long thin pieces that have a seam between them in the middle of each side 180 degrees. That piece is 2 1/2" wide by ??? length depending on how large a block you made. I love these blocks, Jade. Am about to make more and leave them in a step by step mode for the 2 bees I'm in. Have you finished the quilt you were making? Whoever did the blocks in the Christmas fabrics, I have it as a screensaver on my computer. :^))