The Construction Methods of the Stone Weirs: D. Turning - Basalt stones are the major building stones of structures of stone weirs in Penghu. With the polyhedral shape, the experienced repairmen could exert their construction methods to arrange for the black (basalt) stones to fit with each other as puzzles. At first, the repairmen will pinpoint and put the stones at the place with the angle which is better and easier to execute. Next, through turning continuously, the repairmen will try to find the most suitable angle, relative position and general structure of each stone, and also think of how to dissipate the coming waves. At the same time, they need to avoid the risk of being hurt by the oyster shell on the stones or smashed during moving the large-sized stone directly. - Context compiled by isle.travel, 2017.