Looks like a plant stem and blue sky. One possibility is that it is a newly emerged dragonfly that was drying its wings, just as a new butterfly would.

But if you saw it fly onto that perch, scrap that theory.

What else were you doing for that 20 minutes?

That's a new palm frond yet to open.
What was I doing...gotta think back...oh yes!...I was up on my 2nd story front porch, enjoying the Yellow-Crowned Night Herons in the pine across the street.
I was viewing them thru the binocs...that's how I spotted the critter.