The rainbow is an interdimensional gateway or portal to the spiritual world — through witchcraft, spiritual doors are opened to allow evil spirits to possess Monarch slaves — the rainbow is a symbol of demonic possession (see Monarch slaves, Dissociation/Fear and Alchemy).

Two alternate covers for the book The Demons At Rainbow Bridge by Jack L. Chalker, depicting demons crossing over from hell into our physical world via a rainbow bridge/interdimensional gateway
Rainbow coloured hair is used to identify Monarch slaves:

Lady Gaga; she is giving the middle finger salute or the finger of Saturn/Satan (see Satanic Hand Signs)

Elle Fanning in Bullett magazine’s January 2012 issue; below, Elle is depicted on the other side of the rainbow portal — demonic possession

A weeping Elle Fanning as she is being demonically possessed; the crack on her head signifies her madness

A weeping Elle Fanning on the other side of the rainbow portal (demonic possession) with a bionic hand, symbolising a robot/Monarch slave. Elle is also symbolising the ‘Eye of Horus’ (occult knowledge/hidden wisdom) see All-Seeing Eye