This pou depicting Tānemāhuta is at Eden Park, Entry H. It is the only pou I am aware of that is coloured black. From the interpretive plaque:
Tānemāhuta, Maori god of the forests, bears the pou whenua – a tool traditionally used to mark tribal boundaries and engaged with equal distinction as a weapon should those boundaries be contested.
Tānemāhuta is also credited with the ascension to the highest heavens to retrieve the three baskets of knowledge that brought understanding and enlightenment to mankind.
Designed and carved by Arekatera Maihi, Ngāti Whātua, Ngā Puhi, Te Waiōhua. Toitu Design Ltd. October 2010