Rainbow phenomenon developing device

A rainbow phenomenon developing device comprising an arched structural framework defining an opening in which viewers walk, means for spraying fine water particles in the form of a mist mounted on said framework, colored transparent panels mounted on said framework in the same arrangement as that of the natural rainbow color distribution pattern, portions of said water particle spraying means extending through said panels and artificial light ray developing means mounted on said framework inwardly of and spaced from said transparent panels for illuminating the panels when energized whereby under weather conditions where the light rays of the sun are available, only the water particle spray means are operated to provide a mist atmosphere about the developing device for forming a rainbow phenomenon in cooperation with the light rays of the sun whereas under weather conditions where the light rays of the sun are not available, in addition to the operation of said water particle spray means, the artificial light ray developing means are also energized to illuminate the colored transparent panels to develop the colors in the same pattern as the natural rainbow color distribution pattern so as to form an artificial rainbow phenomenon in cooperation with the mist atmosphere developed about the device by the water particles sprayed from the water particle spray means to be observed by viewers within and outside of the device.