Martin Sagrera
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Madrid's placard philanthropist

5 February 2013 Last updated at 13:25 GMT

Martin Sagrera spends his free time making hundreds of placards which are used in protests and demonstrations in Madrid.

The retired sociologist says he only helps in demonstrations he considers to be important for his country.

He explains what inspires him to make the signs.

Video produced by BBC Mundo's Cristina Pop.