A Dreaming symbol of the Rainbow Serpent, as well as a symbol in Western Australia of the Great Spirit’s promise to return to earth, the rainbow has fascinated humanity since the dawn of time. (See Opal) It is often linked with the Gods, forming a bridge between the heavens and earth or representing an omen or aspect of the creator or God.
Rainbows make something where nothing was there; they are caused by sunlight, angle and water content in the air. They colour the air like emotion may colour thought. As a beautiful and strong, or faint and partially hidden, rainbow can seek your attention, so too will something which will uplift you, inspire you. Its intensity will be as unpredictable as that of a rainbow, but it will appear! Rainbows are wonderful!
In some Dreamings, the rainbow is actually the Rainbow Serpent, who created the world, moving from one waterhole to another. At this time he must not be disturbed or he could attack.
It isn’t true, by the way, that you can never reach the end of a rainbow. I’ve experienced one crossing the waters in the Basin, (north Sydney) towards me, in the rain, and so I went into it, and my skin was coloured, and I twirled and laughed and followed in its light, infant daughter on hip! What a fleeting, joyous experience that was – pure magic!
Rainbows form a bridge and as such, symbolise a crossing, a going over something or movement from one level to another. Change is precipitated and may well be as precarious and short-lived as a rainbow, so don’t try to hang onto it, it might disappear! Rainbow represents something which passes quickly, lingering little. So enjoy it while it lasts! You can choose to use that feeling later, re-experience it in your mind, whenever you feel negative.
Things of an elusive nature will haunt you, transient experiences of joy, as well as brief encounters or short-lived events, especially if more than one rainbow seeks you out.
 H. Rule & S. Goodman, compiled by. “Gulpilil’s Stories of the Dreamtime”