Participants in a workshop look at a robot arm during the third edition of the Night of Ideas in Warsaw, Poland, on Jan. 31, 2019. The sculpture was made by a robot from marble sourced from the Italian region of Carrara. The Night of Ideas is a yearly art show with debates and workshops held at the Center for Contemporary Art in Ujazdow Castle and organized by the French Institute. (Xinhua/Jaap Arriens)