Carsten Höller adds Doubt Staircase to 18th century Venetian palazzo

Artist Carsten Höller has created a spiral staircase with an incline of five degrees to make users uneasy at the Palazzo Diedo in Venice.
Höller installed the piece, which was designed both as an artwork and a functional staircase, as part of a renovation of the 18th century Palazzo Diedo by Italian practice Silvo Fassi.
The structure was built within an unfinished staircase that was abandoned after the palazzo's original architect, Andrea Tirali, died.
Carsten Höller added the Do