Chilean artist resurrects 'phantom railings' in London
An interactive sound sculpture by Chilean artist Catalina Pollak uses the movements of pedestrians to evoke the ghost of a lost iron fence in London.
The site of the invention is a garden in Bloomsbury whose railings were removed as part of the war effort during World War II and never replaced.
Roopa Suchak reports.
Video produced by BBC Mundo's Idoia Larrañaga.