What survives is sometimes just by sheer luck. In the Acropolis Museum, there are a few reproductions of sketches on display by Jacques Carrey, a french artist who happened to visit Athens in November 1674. The Venetian's siege of the Acropolis in September 1687 famously destroyed a large section of the South side. Without this artists sketches, we would have no record of these lost parts of the frieze.