Full-Fledged Tiled Namako-kabe
In order to stave off fire, wind, and rats, and also for decorative purposes, people would cover the outer walls of their townhouses with square, flat tiles and thickly plaster over the joints. Because these thick plaster joints resemble a sea cucumber (a much-loved dish on the Japanese dining table), the walls are called namako-kabe (namako meaning sea cucumber in Japanese). The joints are filled with a mixture of sand, slaked lime, seaweed glue, and finely cut hemp and straw, so they do not easily crack due to the glue ingredients. Nowadays namako-kabe walls are made in various places. They may look just the same as the real McCoy, but actually many of them do not employ traditional techniques and are made simply using mortar instead of tiles.
There are several types of namako-kabe pattern. Common patterns in the historical quarter of Kurashiki include the umanori-bari, in which the tiles are unaligned and resemble somebody riding a horse (umanori), and shihan-bari, in which the tiles are placed diagonally. Shihan-bari is said to have improved the shedding of water. Incidentally, the namako-kabe design can be seen on walls inside JR Kurashiki Station too.