Rainbows in culture Rainbows in culture The rainbow, a natural phenomenon noted for its design and its place in the sky, has been a favorite component of art and religion throughout history. The rainbow has a place in legend owing to its beauty and the historical difficulty in explaining the phenomenon. In Greco-Roman mythology, the rainbow was considered to be a path made by a messenger (Iris) between Earth and Heaven. In Chinese mythology, the rainbow was a slit in the sky sealed by goddess Nüwa using stones of five different colours. The Irish leprechaun's secret hiding place for his pot of gold
Pot-in-pot refrigerator Indian Subcontinent, ghara, matka and surahi, which are different types of clay water pots are used to cool water. In Spain, "botijos" are popular. A botijo is a porous clay container used to keep and to cool water; they have been in use for centuries, and are still relatively widespread. Botijos are favored most by the low Mediterranean climate; locally, the cooling effect is known as "botijo effect". In the 1890s gold miners in Australia developed the Coolgardie safe, based on the same principles. In rural northern Nigeria in the 1990s Mohamed Bah Abba developed the Pot-in-Pot Preservation Cooling System,