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The effects of boundary phenomena, ie those at the limit of the measuring range, those that occur slowly or extremely slowly, can be emphasized only with special devices. Recording in time, one picture at long time is cumbersome. Unfortunately, there is no other viable way to measure such effects. Photographs are the appropriate documents for slow-moving phenomena. Time passage is counted with photos and compares them.

 

Photo, the key element in pursuing extremely slow processes.

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Comparison with similar images, shifted over time, shows the evolution of slow phenomena.

 

Comparison over time