In the book, The Rainbow Bridge, Rainbows In Art, Myth And Science by Dr. Raymond Lee, Jr. and Alistair B. Fraser, he says that:
The Igbo people of Nigeria believe that an important Igbo man will die at the place where the end of a rainbow touches the earth.
In Bohemian folklore, girls under the age of seven who pass under the rainbow will change into a person of the opposite sex. In Hungarian folklore, they believe that a person of any age or sex who passes under the rainbow will change into the opposite sex.
The ancient Chinese divination text, the I Ching, says that a rainbow represents the dual yin and yang principles, of male and female opposites which are part of all life. Another Chinese folktale is that rainbows have the souls of two star crossed lovers who will be reunited when it rains and the clouds hide the sky.
In Indonesia, Buginese, who is the son of the sky God, was sent to earth on a rainbow. It was thought that he would prepare the world to be inhabited by humans.
In Hungarian folklore, it is believed that your finger will wither by pointing at a rainbow.
The Iroquois believe that the thunder guardian of heaven known as Hinon, takes the rainbow as his bride.
In Moscow, a folk belief is that when you catch a frog and tie its legs to a ladder, then place a sickle above it to make the shape of a rainbow, that the frog’s cries will cause it to rain.
Some Aborigines believed that the rainbow was actually a serpent that was sent by the enemies to bring rain. The Aborigines of Australia’s Forest River region take initiates through an imaginary rebirth in which the Shaman straddles the rainbow and pulls them both up to the sky.
The Sumu of Honduras and Nicaragua hide their children in their meager huts to keep them from looking at the rainbow and potentially being cursed by it.
The Karens people of Burma consider the rainbow to be a painted and potentially dangerous demon that devours children.
In ancient times in Japan, they believed a rainbow to be as a bearer of bad luck because it represented a snake. See more
An ancient Hindu myth describes how the God of thunder and war, Indra, was able to shoot arorws of lightning from a rainbow in order to slay the demon serpent called Asura Vrtra. In Scandinavia, the thunder God called Tiermes, also used the rainbow to shoot arrows at evil spirits. In the book, the Illiad, by Greek poet, Homer, he describes how Zeus stretches a rainbow across the sky to warn of war. Zulus in South Africa thought that if the rainbow touched somebody, that it would infect a person with smallpox.
The International Order Of Rainbow For Girls is a non-profit, service-oriented organization affiliated with the Masons that uses the seven colors of the rainbow to represent seven teachings that each girl receives on her journey toward the
pot of gold.
Nachmanides, a 13th century Jewish scholar, suggests that it is a bow that is no longer directed at the earth. He explains that the flood with Noah showed God taking aim at the earth, but the bow is now pointing away from earth as in a ceasefire. He says that it is like God is making peace with us. See More.
Anthropologist, Mircea Eliade, tells us that rainbows are vehicles for the shamanic flight to the higher dimensions and usually follows a breakdown in communication between the present existence and the beyond. He describes how the shaman’s drum has a rainbow painted on it or that rainbow colored ribbons are used. During these meditative journeys, the Shaman elevates his or her consciousness to access these higher realms for the purpose of divination.