link). You might call it a wind clock. I have the same basic problems with this sort of arrangement that I have tracking the sun’s apparent path through the course of the year. I tend to forget certain kinds of abstract blocks of knowledge unless I use them daily. And to think that, of our platoon in basic training, I was one of four who actually found his way to the designated point during a compass exercise—and then joined the noncoms in rounding up the rest. They were all over the map—or lost in the folds of the compass rose.