And that, too, was exactly the type of fence I thought of: Mr. Jefferson's! There are those wavering brick walls up at Mr. Jefferson's university in Charlottesville, and I have seen many a drunk waver about those same walls about, oh, 30+ years ago. Amazing that I remember them at all!

Problem is: 1745 is a few years too early for those serpentine walls. I don't remember seeing any in Williamsburg (earlier period), but it's possible...