The double rainbow appeared after the rain, and where was Effie?
But of course!
I’ve read that cats have fewer cones–the nerve endings shaped to pick up wave lengths of light–than humans, and thus they see colors less distinctly than humans do. So, I suppose it’s no wonder that Effie sleeps indifferently on, without giving the rainbow a glance, presuming she can see it at all. Cats are also near-sighted compared to humans, so the far-off rainbow may not be perceptible to her anyway.