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Why are some parts of town are hard to navigate? Mazes may seem like a fun way to spend a Sunday afternoon – but living in a maze can be a problem. Navigation expert Dr Ruth Dalton takes us on a tour of the Barbican Estate in London, a famous example of Brutalist architecture but many people struggle to find their way around the area. She explains the impact of “intelligibility” on a local economy, and outlines a link between map-reading and dementia. Presenter: Tim Harford and Jordan Dunbar Producer: Hannah Sander (Photo: 'Floating' gardens in the Barbican Estate, Credit: Roger Jackson/Getty Images)