Time, space, scale and movement are essential aspects of visual data production. Significant changes in cities’ flows can transpire in just a few minutes, hours or days, span several years or even decades. A diachronic study of an urban environment could therefore concentrate on the repetitive patterns of many activities and phenomena that occur during a day or focus on transformations over much more extended periods of time. There are several photographic methods that specifically focus on documenting this specific change — it is the case of “interval photography”, “time-lapse photography” and other forms of “repeat photography”.1 All these, and others, explicitly aim at sequentially researching social change, and physical and cultural expressions as they develop, over time in a particular physical or cultural space.
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