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I recently saw a micrograph of beach sand and I was astounded by it. It was a beach near a coral reef, and the sand was not tiny rocks but tiny bits of coral. The tiny bits were beautiful and I did my best to redraw them here.... and then liked how they looked inverted!
Colored version here and original version here..
This design is part of my microscope collection. Other neutral grey / black and white designs can be found here.