If there’s one thing sure to put Londoners in a better mood, it’s a giant ice cream van. Or perhaps a sweet potato sprouting leaves? These are just two of the seven shortlisted sculptures being considered to takeover Trafalgar Square’s Fourth Plinth in 2026 and 2028. Celebrating its 25th anniversary this year, the initiative chooses a different artwork to adorn the grey slab every two years. Prue Leith, who was chair of the Royal Society of Arts, sparked the idea in 1994 after writing a letter to the Evening Standard paper suggesting something be done about the empty plinth. Since then, it’s b…