When the Sun warms water, water evaporates and rises towards the Sun. There it gathers new light; it is renewed. The molecules of water receive an update of the Divine Plan. Light comes anew from the Source of All through the consciousness of the Sun to be given to the Earth as rain or snow.
When light is refracted through raindrops to create a rainbow, you can see the light of oneness revealed in the colours of the spectrum; the one becomes many.