The attempt to keep one’s treasures in a specially protected place, away from all harm, is natural to all creatures. Human beings developed the `safe’ over a long period of time after much trail and error. A safe has now come to mean any large room or box which is used to keep valuables secure. Only the owner of the safe can open it to get his or her valuables. A safe is generally fitted with a vertical door, which is different from a lid.