Ptero IV is the 4th sculpure in Ptero series. Ptero series get inspiration from the Museum of natural History in Milano. The first, iron made, called simply Ptero is inside AtelierFORTE at number 7703. The second, Ptero II, was exposed during the exhibition “Arkizoic Project” in 2016 at Biologiska museum in Stockholm, now is in a private collection in Sweden. Ptero III after Storming of the Bastille at Reggia di Caserta, the exhibition in Rome at MAXXI and PTEPERO installation at MART in Rovereto now is in a private collection.