A mountain of chairs piled between buildings. Shoes sewn behind animal membranes into a wall. A massive crack running through the floor of Tate Modern. Powerful works like these by sculptor Doris Salcedo evoke the significance of bearing witness and processes of collective healing. Salcedo, who lives and works in Bogota, roots her art in Colombia s social and political landscape including its long history of civil wars with an elegance and poetic sensibility that balances the gravitas of her subjects. Her work is undergirded by intense fieldwork, including interviews with people who have...