Tate Modern, London

The structural repair of the “Shibboleth” induced crack in the concrete floor slab, width varying from 0.03mm to 300mm, after the close of the exhibition. Shibboleth was the title of a temporary art installation placed by the Colombian artist Doris Salcedo in the Tate Modern in 2007.

The work took the form of a long crack in the Turbine Hall floor. Rather than fill this iconic space with conventional sculptures, Salcedo created a subterranean chasm that stretched the entire length of the Hall.