Between the blue and the violet,
Isaac Newton saw indigo.
Cool and deep.
Some centuries later,
Isaac Asimov said,
“It has never seemed to me
that indigo is worth the dignity
of being considered a separate color.
To my eyes it seems merely deep blue.”
Both Isaacs did good work but it seems to me
That Newton led the more enchanted life.
This I can say, based on personal experience:
My windowsill was not complete
Until I placed an indigo flower and a sphere of clear bubbles
Between the blue and the violet.
Now my heart sings.
Everlasting Arms 