If you saw an aeroplane overhead writing an advertisement for a tobacco company in coloured smoke, what would you think? Or what if you looked up while walking through Elephant and Castle to see an electronic sign telling the result of a prize fight that had just finished in the Royal Albert Hall?
In 2022 one would probably think very little of such things, but back in 1922 these were new phenomena – dramatic, state-of-the-art advertising techniques.
