"It is too heavy for most people to lift so whoever has taken it would have had to use a trolley or something else to move it".
"Given how distinctive it is we believe someone will either recognise the sculpture or remember people talking about it. We aren't ruling out the possibility that it has been taken simply for the value of the metal it was made of," Mr Miller said.
Scrap metal dealers who know of people wanting to trade "significant quantities of copper" should contact police, he said.
Anyone with any information should contact Wellington Police on (04) 381 2000. Information can also be provided anonymously through Crimestoppers on 0800 555 111.