A large part of Paris’s water supply was taken from the river Seine using an outmoded pump located on the Île de la Cité, or City Island. Baron Haussmann’s public works program called for alternative sources that would make the picturesque structure redundant. Built on stilts in about 1670, the building was condemned by the time Charles Meryon made this plate, and later demolished in 1858. The perspective on the pump is from the river and includes the twin towers of Notre-Dame behind the embankment housing. Meryon allowed himself this artistic licence, believing it reflected the way ‘the mind works as soon as actual objects which have arrested its attention have disappeared from sight’.