A recreation of a sculpture destroyed by the Islamic State group is the latest artwork to be unveiled on the Fourth plinth.
The Invisible Enemy Should Not Exist, by New York artist Michael Rakowitz, is a replica of Lamassu, which was destroyed in 2005.
London's Mayor Sadiq Khan unveiled the creation, which is made out of 10,500 tins of Iraqi date syrup.
It is the 12th sculpture to occupy the plinth, in Trafalgar Square.
The original Lamassu, a winged bull and protective god, stood at the entrance to the Nergal Gate of Nineveh from 700BC.
It was destroyed, along with other artefacts in the Mosul Museum, in 2015.