People visiting Auckland's Aotea Square today can get a glimpse of what it's like living in a solitary confinement prison cell.
Advocacy group People Against Prisons Aotearoa have installed a mock prison cell at the square to protest the practice.
Solitary confinement can last from 20 to 24 hours a day.
According to People Against Prisons, a New Zealand prisoner is put in solitary confinement every 43 minutes.
The group will be in position until 7pm.