Each major secret-sacred ground painting represents both an individual identifiable geographical locality and a mythological incident that occured there, although is inevitable that related sites and incidents will also be recalled. As there are hundreds upon hundreds of differents sites in a tribal territory, ranging from individual tress or rocks to mountains, the most learned old men may well know the details of hundreds of paintings - even possibly, of more than a thousand. The designs must be relatively static in composition and have persisted over a great meny generations to allow for such feats of memory.