Steve,
No problem. I was a little too sensitive in my reading of your question. This is a public course, so I doubt that it is ever closed during the season. I'll shortly be posting other pictures of the course where these mowing patterns stand out on the greens. You can see what you think it is, if not mowing, from those pictures.
Ally, Jon, Mark,
I, too, liked the feature because it was so unique to me. This greenkeeper also seemed to have a penchant for putting flags near these features.