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The gravity of the Moon that produces the tides, the light pollution from a nearby village, the wind that sweeps the clouds away...so many invisibles forces that make each photo unique :)
I took this picture in San Juan de Gaztelugatxe, Spanish basque country. I forgot my remote so I was stuck at 30 sec max, I boosted a bit the ISOs but I'm glad I had to stick with 30sec only. More than that and all this dynamism caused by these forces would have been blurred into time :)