by Yirawala in the Museum of Contemporary Art Australia (ochres on bark).
"In Kuninjku cosmology, the world is divided into halves or moieties. There are both patrilineal moieties (inherited through one's father) and matrilineal moieties (inherited through one's mother). The patrilineal moieties are known as duwa and yirridjdja. All people, land, clans and Djang emblems are classified into either moiety. The matrilineal moieties, although now less often used in western Arnhem Land, are known as mardku and ngarradjku."