I can't figure it out and my eyes seem to find asymmetry or "what's wrong with this picture" kind of issues. So when
are you going to spill the beans?
Edit: Okay, I went back and looked again--it must be the vertical stripe thing (all one direction in one block but mixed up a bit in another). Is that it???? I have to go to sleep and I can guarantee that I will be thinking about this until I fall asleep!!!