The same basic instrument is still in use to create tattoos today.

BBC: More antibodies are created with the tattooing method

In the run-up to the G20 summit in Seoul, Lula's finance minister, Guido Mantega, told journalists that Ms Rousseff "wants to work with lower interest rates" - a move that puts her at odds with Mr Meirelles' avowed strategy of using rate rises as "the basic instrument" to control inflation.

BBC: Brazil's inflation hawk Henrique Meirelles bows out

During a recent master-class at the Metropolitan Museum in New York last month, he urged his students to try and understand the basic language of their instrument.

ECONOMIST: Early music

"The basic idea of a hyperinstrument is where the technology is built right into the instrument so that the instrument knows how it's being played literally what the expression is, what the meaning is, what the direction of the music is, " Machover says.

NPR: A Composer At The Edge Of Sound