Cool looking fruit fly but what kind?

This is a common fruit fly in our yard. I see them almost daily on the top rail of the deck or on the deck funiture doing a weird kind of display. It can move each wing independently up and down and will also rotate the wings separately like the guy with those paddles guiding planes on an aircraft carrier or someone signaling with semaphores. The display is quite enchanting though I don't know why it seems to do it when people are around. I don't seem to see another fly nearby so I guess the display is for us.

I don't see them on either the plum, peach, blueberries or tomatoes so I don't know what it eats. The mouth parts seem to be rather large, like a suction cup, with Angelina Jolie lips (first photo, side view) so I would guess it eats by lapping up fruit juices.

The beautiful wing pattern is most interesting and intricate. I tried to look it up using the the patterns below but it seems to be much more baroque than any illustrated.
Wing patterns from the University of Wiconsin Madison news site.

Here's another listing from the University of Maine website. We do have lots of blueberry plants but I don't think the wing pattern is conclusive and I have not seen damaged fruit.

Well, I finally looked it up on the What's that bug website and someone wrote that it could be Delphinia picta, a picture-winged fly. I Googled it and found it on the University of Florida Institute of Food and Agricultural Sciences website

Here are more photos from the BugGuide.net site.

So "there it is".