I took this while my wife and I were on our second anniversary. This cave goes 505' under ground. I'm hoping that I did this right. If not I didn't know for sure how to make the negative look.
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Sorry, not a big fan of abstract photos and this is no exception, bet it looks cool "uninverted" but I have a feeling you just took this and inverted to be in this challenge.
Interesting shapes, however without a focal point it doesn't really retain my attention. I think slightly more contrast could have added interest to the image.