The original woodwork named as "Sakhalin Iruga" with the motif of the traditional pattern "Iruga" of the northern minority "Oroks ".

"Iruga" means "pattern" in Orok, and each of the northern peoples of Sakhalin and Siberia has their own Iruga and uses it as the "face" of the people like the Japanese family crest.

The swirl pattern seen in the design represents the spectacular flow that occurs when the Amur River melts.