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Do ubiquitous advertising like billboards, posters and banner ads lead to mental overload? American author Matthew Crawford discusses whether the constant distraction of ever-present commercials leads to 'mental fragmentation'.

Daniel Gallas reports from Sao Paulo in Brazil on the city's decision to ban 'visual pollution', including all outdoor advertising, a decade ago.

And, Ed Butler hears from Nick Gill, planning director at advertising agency Doner, and why he thinks outdoor advertising is part of the lore of a big city.

(Photo: Tourists at Picadilly Circus. Credit: Michael Lloyd/ Getty Images)