Actually, it’s Newton’s Rings again, a rainbow effect caused when white light shines on really thin films of transparent stuff.  In this case, I don’t know what the transparent stuff is.  The material beneath is semiconductor laser material.  I was trying to clean it with alcohol, but the alcohol didn’t dry cleanly, and left some gunk.

But I liked the look of this bit - it looks like islands to me, especially if you think of the rings as topographical markers (which essentially they are).  Looks like a nice place to set a fantasy novel.

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