Perhaps a purist will scoff, a musicologist for example, when I hitch a rainbow (a double rainbow) to resonance. But I’ll claim poetic license long enough to sneak past the physics police or whoever else patrols these matters. Rainbow resonance isn’t just a pleasantly alliterative title for this post. It’s an observation. Rainbows — witnessed in person, via image, or in words — resonate. They reverbera