Eco friendly rainbows for free in your roomr r r stick the solar power rainbow maker in any window that receives direct sunlight and you will have numerous rainbows projected onto your walls using the power of the sun the swarovski crystal will rotate and the rainbows will move around the roomr r a very nice product that demonstrates solar power and the splitting of light into its basic colours the solar rainbow maker is available with either a heart shaped crystal or an octagon shaped cryst