To celebrate the beginning of the works for Tate Modern’s new extension Swedish artist Martin Karlsson has created a project on the 100-metre hoarding that encloses the building site.29.07.2010 To celebrate the beginning of the works for Tate Modern's new extension Swedish artist Martin Karlsson has created a project on the 100-metre hoarding that encloses the building site. London – An Imagery 2008–9 takes as its starting point Gustave Doré's gothic etchings published in 1872. In this film Karlsson tells us how his drawings update this portrait of the city and its inhabitants.  The project can be seen on the hoardings behind Tate Modern until December 2010.