There is a common belief that only things that can be seen, actually happened, as if there is no place for private memory. “To” witness and “a” witness are the key of history. Herodoto and Thucydides began the tradition many years ago. The importance of the trace, and the document have only grown in time: voices, notes, systematizing, catalogues, archives, photos, all resources that evidence that yes, something took place.

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