Rime ice again

This amazing formation on the trig point of Crag Hill is likely to be hard rime. It is not clear and it is not spiky like soft rime. It seems to show wind flow around the column. In fact, the individual bits are a bit like a vector field. What causes the separate parallel sections to develop is not clear. Is it only certain bits of the stonework that can take the first water droplets or is it just chance? Also, does a bigger chunk indicate a faster wind speed? This would be explained by more frequent arrival of supercooled water droplets.