epa06142314 A cardboard tower with a height of 20 meters and a weight over a tone is brought down during the street festival "Les Jeux du castrum" in Yverdon-les-Bains, Switzerland, 13 August 2017. The piece and performance designed by French artist Olivier Grossetete has brought back to life a replica of the former 19th century "Tour de la Plaine" tower from Yverdon-les-Bains. EPA/VALENTIN FLAURAUD