article_snippet: These include boards in Los Angeles, New York and Chicago.
article_snippet: user Siena Liggins added that user Siena Liggins hopes the bright adverts would appeal to millennials. '
article_snippet: Above, this mocked-up picture, by Kastner and Partners, shows what one of the billboards will look like .
article_snippet: Another digitally created photo shows what the adverts could look like in shopping malls and train stations . '