Trafalgar Square Fourth Plinth: Trans and non-binary faces unveiled

Improntas was made by applying plaster directly onto the faces of the models, many of whom were sex workers, so the material became infused with the sitters’ hair and skin cells.

The casts are arranged around the plinth in the form of a tzompantli, a skull rack that featured in Mesoamerican civilisations, used to display the remains of war captives or sacrificial victims.

Margolles has said the work recognises a community that is often marginalised, in both her native Mexico and around the world.

The three other plinths that surround Nelson’s Column feature George IV and two 19th Century military figures instrumental in Britain’s control of India, Charles James Napier and Henry Havelock.