Piling the stones, Anouzumi (stone walls)

After the stones have been piled into an outlining formation, small stones called guri-ishi are then used to fill the inside. Doing so facilitated draining which can help prevent the wall from collapsing. While the stone wall shown here sits over a concrete base, when building castles stone walls, the walls are actually constructed on a earthen base, over which guri-ishi stones are first laid.