On top sits a copy of the American Declaration of Independence, a ukulele and a cartoon blow-up doll of Brazil's former president, Luiz Inacio Lula da Silva, dressed in the black-and-white stripes of a prison uniform, sporting an inmate's number.

Over the former president's mouth, it reads "Menos Marx, mais Mises" — less Marx, more Mises, the latter referring to libertarian pioneer Ludwig von Mises.

Ostermann, 32, is a key player in Brazil's growing libertarian movement, which has risen against a backdrop of the country's collapsing left. He's led youth groups on college campuses, co-organized some of the country's largest-ever protests — which may have helped impeach the country's leftist president, Dilma Rousseff. Now, he's the president of the Social Liberty Party in his home state, which he is reforming to defend classical libertarian ideals.