see outside mathematics only as embodied in the time-bound particulars of the manifest world. In this way, mathematics extends our problem solving powers as an extension of human insight, but it is not a part of the world. Political engagement Unger has a long history of political activity in Brazil. He worked in early opposition parties in the 1970s/80s against the Brazilian military dictatorship, and drafted the founding manifesto for the Brazilian Democratic Movement Party (PMDB) in 1980. He served as an intimate adviser to two presidential candidates, and launched exploratory bids himself in 2000 and 2006. He was the Secretary for Strategic Affairs in the Lula administration from 2007 to 2009, and is currently working on a number of social and developmental projects in the state of Rondônia. Driving Unger's political engagement is the idea that society can be made and remade. Unlike Mill or Marx, who posited a particular class as the agent of history, Unger does not see a single vehicle for transformative politics. He advocates world-wide revolution, but does not see this happening as a single cataclysmic event or undertaken by a class agent, like the Communist movement. Rather, he sees the possibility of piecemeal change, where institutions can be replaced one at a time, and permanent plasticity can be built into the institutional infrastructure. Early political activity, 1970s and 1980s Unger's engagement in Brazilian politics began in the late 1970s as Brazil started to democratize. In 1979, he presented himself to the main opposition party, the Brazilian Democratic Movement (MDB), and was appointed chief of staff by party leader Ulysses Guimaraes. His initial work was to develop the positions of the party and draft policy proposals for their party's congressional representatives. When the military regime dissolved the two-party system and established a multi-party system later that year, Unger worked to unite progressive liberals and the independent, non-communist left into the Brazilian Democratic Movement Party (PMDB). As a co-founder of the party, he authored its first manifesto. Unger left the party after the rise of a conservative faction, which was a part of the MDB but had been excluded from the initial formation of the PMDB. After departing the PMDB in the early 1980s, Unger began looking for political agents who would serve as vehicles for his national alternative. In 1981, he jointed the Democratic Labour Party of Brazil (PDT) led by Leonel Brizola, a former