My quilts are never perfect. I have a friend who uses a small ruler to measure everything.ie, rolling back the cathedral window sections she measured to ensure exact.. When you are by hear it drives me batty. But the other day she was was making a back fixing a pocket on a bag and I realised that her rectangle 10 by 8 was the wrong way. She could not see the different lengths no wonder she has to measure. I'm trying to understand why she does it.