A facsimile is a technical and mechanical reproduction of a unique model of cultural or historical significance. It comes from the Latin “fac”, to make, and “simile”, similar. Facsimile editions perfectly fulfil a double function: on the one hand, they allow the originals to be preserved without being damaged, and on the other hand, they allow researchers and art and book lovers to have access to their treasures, preserving and at the same time disseminating our cultural heritage.