Today has been preoccupied by the opening of our exhibition Radical Geometry:  Modern Art of South America.   It’s a period of art with which I was wholly unfamiliar:  abstract, lucid, strongly idealising, politically motivated, bringing the language of modernism from the Bauhaus to south America.   I particularly like the wonderful third room which includes playful, wire, polyhedral sculptures from a group of Venezuelan artists called The Dissidents.   The work all comes from the collection of Patricia de Cisneros in New York and the curators are both graduates of the Latin American studies programme at Essex University.