The first night of my '92 visit, I 'experienced' (its the only word) one of Folegandros' wild winter windstorms---you have no idea. The following morn after things had calmed down, the entire isle was surrounded by an alien turquoise ring. That'd been caused by the local hillsides of green schistoze slate having been washed down into the Aegean. The above shot barely approximates that special visual.