Yea, this definitely dates me a little bit. Lol. The first one naturally occurred that way one night when I worked overnights on the Missouri State University campus. The other three were taken while visiting Puerto Rico. I've always loved the last one which was taken through a cell at the Old San Juan fort out at the Caribbean sea. It reminded me off elementary school art class when we would color over an entire piece of paper with crayons, covering that all with black crayon and then scratching a design into it which would expose the colors underneath.
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All taken by me. I think with an old cannon digital camera. It was so long ago it's hard to say for sure.