As the world turns toward another fractured year, Doris Salcedo, the Colombian artist, is at work trying to fathom how to create a house out of human hair. Salcedo, 65, has long made herself a channel of collective trauma, her art expressing profound anger at political crimes and atrocities at home and abroad – as well as creating imaginative spaces for mourning. Her hair project, she says, comes in response to what she has come to think of as “domicide”: the calculated bombing and destruction of places that people call home. “Most of my work is a response of some