One of the legs of Christchurch's Fanfare sculpture has suffered damage after a car drove into it.

Christchurch police are trying to figure out how a car crashed into the 25-metre tall Fanfare sculpture just off the city's Northern Motorway.

Acting Senior Sergeant Jim Currie said police, fire and ambulance were attending a "car versus sculpture incident".

The crash happened shortly after 7:45pm on Friday. Currie did not believe anyone in the car was injured.

SUPPLIED The sculpture, off Christchurch's Northern Motorway, was blessed at a ceremony in June 2015.

"They've hit one of the legs of the thing," he said.

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Fanfare, by prominent New Zealand artist Neil Dawson, sits at the corner of the Northern Motorway and Chaneys off-ramp, north of the city.

The 25-metre tall sphere is covered in 360 spinning metal pinwheels and is one of the largest public artworks in New Zealand.

Currie said there had been no interruption to traffic as a result of the crash but one of the sculpture's base poles had suffered a "little bit of damage".

The sculpture sits on a large grassed area between the motorway and off-ramp, known as Chaney's Corner.

Fanfare was originally commissioned by the City of Sydney for the 2005 New Year celebrations. It was raised from a barge at midnight and suspended from Sydney Harbour Bridge for a period of three weeks.

In 2007, with the support of Dawson, the Lord Mayor of the City of Sydney, Clover Moore, gifted it to the people of Christchurch

Dawson also created the Chalice in Christchurch's Cathedral Sq.