Michelle Barger, deputy head of conservation at SFMOMA, elucidates the painstaking labor behind Colombian artist Doris Salcedo’s Unland: irreversible witness (1995–98). “It’s really natural to want to forget a tragedy, to bury it, to push it away — or in fact to not even think about it, in a country like Colombia. I think what Doris does is try to return the dignity of that person’s life through these works,” she says.