It takes a talented quilter to develop a brand new technique. I think you should call it 'shadowing'. Write a book on shadowing techniques, and before you know we'll all be doing it! It just makes me feel queasy that this absolutely gorgeous quilt could be deemed as 'having a flaw'. It is far too beautiful in its entirety to let that shadow detract from it. In fact, it should go on the cover of your new book. I will buy a copy.