The Twisted Chimney (Simnai Dirdro) is based upon chimneys from early ironworks which would have been common throughout the Rhymney Valley. It is the first permanent UK sculpture by New York based artist Brian Tolle and was unveiled in 2010. Standing 16 meters long and 8 meters high its’ aim is to create a futuristic vision rather than being a literal depiction of the past industrial heritage of the area. It is situated on land near the former Union Ironworks that was part of a railway line. The sculpture has been carved in polystyrene and then coated in 6mm of Armour-Lyte for durability and strength before being painted by the theatre company Steel Monkey.