dianavan,

I like your belief that rainbows are path for soul waiting to be born.

It's the opposite of the idea I had as a child that rainbows are the path that people who died use to walk to up to heaven.

But both of them can be true.

****
And since we're speaking of rainbows, here's a is a 1940 song called "Playmate" {words & music by Saxie Dowell}:

Play-mate, come out an play with me,
And bring your dollies three
Climb up my apple tree.
Look down my rain pipe.
Slide down my kitchen door,
And we'll be jolly friends
For ever more.
{quoted from Opies's "The Singing Game", 1985

Children in the USA, Great Britain, and elsewhere have transformed this song into a rhyme called "Say Say My Playmate {Cee Cee My Playmate}. This rhyme is often chanted while doing handclaps.

Instead of saying "look down my rain pipe", children often say "slide down my rainbow"; open my cellar door..any we'll be jolly friends for ever more.."

That's the folk process at work!!

"Slide down my rainbow" makes more sense than "look down my rain pipe" any day!