Centennial sculpture

Went for a lunch-time walk in the Auckland Domain (Pukekawa), and sat in the sun to eat my sandwiches. On the way back to the unit, I happened across a sculpture which was created to mark the centenary of Auckland. I believe that the sculptor was English-born William H Wright, but I may be wrong. 

A plaque in front of the sculpture records that the central figure symbolises young Auckland finding its strength. The figure on the right represents wisdom, and is presenting a bay leaf. On the left, fertility (of soil) is offering a cornucopia.

I was intrigued that the sculpture is also known as the Three Witches, and the Three Muses.