I've done a few more bands of this pattern. When you first look at it you see the dark birds flying to the left, but if you let your eyes unfocus, you'll see the light birds flying to the right. Or at least I do.
I can't decide whether to do any more of this design, or whether to start another one.
I'm not the only blogger to hit upon the combination of Kauni and Anna Zilboorg's Fancy Feet: String Theory has done it too and is making a wonderful Turkish cardigan.