When war meets art: Doris Salcedo on representing violence without violence

After 50 years of bloody civil war in Colombia, which has claimed the lives of at least 220,000, including 177,000 civilians, a fragile peace has emerged in the South American country.
Now, thanks to sculptor Doris Salcedo, ordinary Colombians who lived under the weight of two generations of violence can walk on the very weapons that used to control their lives.