Leakus-I think I know where the house number may have gotten switched-when I addressed your envelope I used the address label you sent to me on the fabric-I read it as 5711 not 7511-but it could be my dyslexia-it really comes on when I'm tired.
The disappearing 4 patch is like a D9P-only you start a 4 patch then cut it into 9 equal pieces and reassemble them into an eye pleasing arrangement. After I had 2 rejects-didn't like them at all, looked like I just sewed 2 half blocks together, very bad there was a clear division of color and pattern I realized what I had done wrong. Had to redo 2 blocks. But It's a fairly quick block to do once you get the hang of it, I made 11 today. I found I really like the way it comes out. I found the idea on the site awhile back and decided to try it out.