Appadurai credits Benedict Anderson with developing notions of imagined communities. Some key figures who have worked on the imaginary are Cornelius Castoriadis, Charles Taylor, Jacques Lacan (who especially worked on the symbolic, in contrast with imaginary and the real), and Dilip Gaonkar. However, Appadurai's ethnography of urban social movements in the city of Mumbai has proved to be contentious with several scholars like the Canadian anthropologist, Judith Whitehead arguing that SPARC (an organization which Appadurai espouses as an instance of progressive social activism in housing) being complicit in the World Bank's agenda for re-developing Mumbai.