In 2014, with an iPhone 5s, I took an undistinguished photo of a dead end alley in downtown Santa Cruz. I started fooling around with it in BeCasso (I think) and created two variations:
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Still not satisfied, so I layered the two together in Leonardo, and fooled around with blend modes until I hit the Difference blend:
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Whoa, I like that! And this version became the base for the first of my Cat Dreams series, which is one of my all-time favorites: