Under its fake radicalism, Banksy’s Girl with Balloon is the kind of sentimental tosh our great grandparents too would have voted as Britain’s best-loved. Its kitsch pathos resembles one of the most popular Victorian images, John Everett Millais’ painting Bubbles, a picture of a child blowing bubbles used as an advert for Pear’s Soap. Today we laugh at it and sneer at them for liking such soppy stuff. Imagine how future generations will mock us for sanctifying Banksy, the Boaty McBoatface of modern art.