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Hey Jim - you just discover the negative exponents ?!?
I have known about them for some time; I even made an animation of the default MSet with exponent -7 -> +7 a while back.
A few years ago I was investigating these, and most of the images are very similar to yours - characterized by all sorts of roundish blobs and very complex patterns.
You should look into it more - should come up with some interesting FOTD images in the future.
BTW, in science we don't call things like this "blunders"; we use the word "serendipity",
that is, a good result or discovery resulting from chance error.
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