TORONTO - Stumbling zombies, a prison chapel waterfall and Yoko Ono's "Imagine Peace" project are among the art installations coming to Toronto's Nuit Blanche festival this fall.

The all-night festival of contemporary art will feature dozens of free displays running from sunset Oct. 4 to sunrise Oct. 5.

Organizers say it will include Ono's "Imagine Peace" project, a three-part interactive display based on the sentiments of the late Beatle John Lennon's song "Imagine."

One part of the display is called "Wish Tree," and it will invite visitors to write a wish on a piece of paper and tie it to the branch of a tree.

Other events include "Zombies in Condoland," in which hundreds of people dressed as zombies will take over a downtown parking lot and park, with viewers encouraged to come dressed for the part.

Artists will also transform city hall into "the world's largest interactive computer screen," set up a three-storey waterfall to skim the outside of a former prison chapel and invade the financial district with nouveau cabaret.