For rhetoric about this pattern, see Ladders 1a and 1b.
18 April 2019 UPDATE—A blog friend informs me that this pattern—perhaps feeling it didn’t get enough individual attention—has made another appearance under a different name a few weeks later. It’s now going by the name of Lattice Borders original, amended. It’s difficult for me to keep from running across the same patterns from time to time—especially the simpler, more elegant ones. I once invented a pattern I really loved and called it Basketweave, only to discover that it was good old Horizontal Xs. I also called one Withy Fence, but it was Horizontal Xs all along.