well, maybe its natural ? I wa slooking at this guy's gallery, and copied a pic I found there, and the shadows rotate much as my Vue render up above. That's a pretty interesting thing, actually. I will have to be more observant when I go out this morning.

Humankind has not woven the web of life. We are but one thread within it.
Whatever we do to the web, we do to ourselves. All things are bound together.
All things connect......Chief Seattle, 1854