Pompeii is one of the most significant proofs of Roman civilization and, like an open book, provides outstanding information on the art, customs, trades and everyday life of the past. The city has re-emerged from the darkness of centuries precisely as it would have been when it was unexpectedly buried in the thick layer of ash and lava which poured down from the devastating eruption of Vesuvius. The scale of the tragedy was appalling: in what had been one of the most active and splendid Roman centres, life came to a permanent standstill. The thick layer of volcanic material which submerged it, made up to a large extent of ash and lapilli - non-hard material, unlike that which covered Herculaneum and which solidified into extremely hard stone -has meant that the city has remained intact until the present day, not only as far as its buildings are concerned, but also as regards the contents inside the houses and shops, providing an absolutely fascinating picture of "daily" life.