An investigation is under way to establish who left it there and why.

Public and private organisations can support projects receiving visibility in return. A first deadline has been set for October 21, 2026.

Seven works spanning more than two decades of the Turin artist’s career are on display at Palazzo de’ Rossi until February 14, 2027.

The monument will remain open to visitors, while the construction programme has also been adapted to protect peregrine falcons nesting on the tower.