Who has the right to the city ? Henri Lefebvre 's writings question the structures that control urban space and, instead, put the citizens at the center of decision-making. His ideas have influenced the way architecture and urban design are practiced, bringing about community participation and co-design . These have been some of the most prominent themes at Utopian Hours 2026 , the festival of city-making, the first part of which was held in the Dutch city of Rotterdam to mark its tenth annivers