In 2007, Colombian artist Doris Salcedo was invited to take over the Turbine Hall of Tate Modern, London, for the eighth installment of The Unilever Series. Her installation, titled Shibboleth, consisted of creating a 548-foot-long (167 meters) fissure in the floor of the vast space, into which she placed a concrete cast of a Colombian rock face with a chain-link fence set into it.

Shibboleth ran from October 2007 until April 2008, yet the group of four photographs offered here was executed between April and October 2007. They are in fact digital composite images made from color transparencies of Turbine Hall as it looked before Shibboleth was installed, and photographs of Salcedo’s small-scale model of the cracked floor housed in her studio in Bogotá, Colombia.

Click here and watch the video below for more information about the artist’s process and the meaning behind this powerful installation.