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Hundreds of plaster casts of transgender and non-binary people have been unveiled as the latest installation on the Trafalgar Square Fourth Plinth in central London. Called 850 Improntas - which translates to 850 Imprints - the sculpture was created by Mexican artist Teresa Margolles. Â鶹Éç Radio London's Nicky Ford went down to Trafalgar Square to find out more. (Image credit: Getty Images)