>Anne LaVin his (most excellent) article on diagramming, Robert Lang writes: >"An arrow associated with a mountain fold has a single-sided hollow >head (figures 9 and 10 show examples). It should be used whenever the >paper is folded away from the reader, and to emphasize this motion, >the arrowhead should hook behind the moving flap if that is the >appropriate motion of the paper. As with the valley fold, hooking the >arrow around layers can eliminate ambiguities about what goes where."....
Ok, yes...right...the line style shows the type of motion...the arrowhead shows the direction of the line style motion...hooking the arrowhead shows wrapping around layers. Finding the hollow head/hook arrowhead a barrier in a recent diagramming instance, I noticed the solid arrowhead would work perfectly to show the direction of the mountain motion, eliminating the hollow head/hook arrowhead problem. And thus continue to wonder, is the hollow head/hook arrowhead really showing direction?
