The eerie spectacle, which involved actors dressed in black carrying skeletons, was part of a new video project by the director, who is the 2021-2024 Grand Invité at the Triennale Milano.
He recently presented his latest show, Bros, at the event.
The surprise piece of theatre, produced by Triennale and Societas, saw the troupe of skeletons march through the centre of Milan, from the Triennale to the famed Duomo and back again.
On the significance of the performance, Triennale president Stefano Boeri described the “hundred silent demonstrators” as “the humanity of the past”.
“Witnesses of the past, they’ve decided to make their weight felt,” Boeri told Italian news agency ANSA.
“These skeletons don’t want to frighten or instill fear or, on the other hand, have fun.
“They don’t want anything, actually.”