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Today's treatment of this photo is called Underpainting. I found that alteration app at BeFunky. It certainly changed the look of the Sentinel Tree and the fields around it.
In case you haven't been here this week, here's the back story: A Flickr friend who lives in Portland commented on an altered version this photo that I will post later this week. I took the name for today's post from his comment, "Looks like it is the guard for these rolling fields."
Tomorrow I'll share the photo that inspired my friend's comment. Thanks, Terry!