She was commissioned by the Landscape Institute to celebrate its 75th anniversary.
It is hoped the exhibit will prompt people in the busy shopping street to be more aware of public spaces.
Ms Entwistle said: "Grey Street is a magnificent setting and fantastic opportunity for me to locate my sculpture in this city, I hope it focuses people's attention, so that they stop, and reflect on the quality of place."
She has previously overseen two similar projects in Barnsley and Scarborough and was helped by landscape architecture students from Newcastle University.
Nancy Corbett, of the Landscape Institute, said: "IncLINE is intended to be both fun and accessible.
"It creates a green sanctuary and a temporary retreat from the hustle and bustle of city centre traffic."