I wonder about this stuff too, all the time. How about the "celtic knot" motif being so similar to Islamic patterns? We owe it to ourselves to sort it out, or do we? Can we? A small world gets smaller, my culture is a parody of yours, and yours, well, a parody of another! Surely art and music have the stuff that can save us as a species, if we pay attention. Let's Polka!