New Zealand Māori People Ancestor Mask: "Koruru"

This "koruru," Māori for mask, would have been mounted on the gable of a meeting house. Such a koruru is referred to as "the guardian of the house". Its eyes are made from paua shell, an abalone shell that is native to New Zealand.

The Māori believed certain structures, such as communal meeting houses, the houses of chiefs, and some food storage buildings, symbolized the body of an important ancestor. The ridgepole represented the backbone, the rafters the ribs, and the slanting facade boards the arms. The koruru would be placed at the peak of the gable to depict the face of the honored ancestor.
Source:
http://www.kiwitreasure.com/889-hand-carved-maori-koruru-mask.htm
http://www.brooklynmuseum.org/opencollection/objects/16244/Gable_Mask_Koruru