What is Hollow Dogū?

The so-called "Hollow Dogū" is a Japanese dogū or clay figurine of the Late Jōmon period. A chance find from what was to become the Chobonaino Site in Hakodate, Hokkaidō, it is exhibited at the Hakodate Jōmon Culture Center. it is one of five dogū that have been designated National Treasures. The other four include "Dogū with palms pressed together" from Aomori Prefecture, "Jōmon Goddess" from Yamagata Prefecture, and "Jōmon Venus" and "Masked Goddess" from Nagano Prefecture. It is also the first and, to date, only National Treasure in Hokkaidō.