I've been lucky to see and photograph these sublime clouds often. They occur when most water droplets are the same size, refracting the sun in a collimated way. You can see all my best iridescent and other cloud photos here
At age 12 I wrote: "If we don't become more like the Indians, more cooperative in our relations, we will destroy ourselves." I didn't know anything about climate change or financial meltdowns, but I could FEEL. I started Vote.org in 1995 to do something about it. I was professional not-so-tight-rope artist and juggler Evan from Heaven for 20 years. Yet, of all those politicians "walking a fine line" only my friend and Congressman Jared Polis has consulted me!
I'm using a black background to make the photos "pop." (Readers backed me up 2-1 in a poll.) My blog is just random things I want people to know about. Please comment or you can always email me privately: evan (at) vote.org