From October 2009 to April 2010 a 30-metre long, 10-metre wide and 13-metre high grey steel sculpture resembling an enormous freight transport container occupied Tate Modern’s Turbine Hall. The structure was entirely fabricated out of raw steel and was raised above the gallery floor on a series of ten 2-metre high stilts. Visitors could either walk underneath the structure or around it. They could also choose to enter the vast interior via a 10-metre wide steel loading-ramp that extended downwards to the gallery floor and had low steel walls running up its sides. The entrance to the structure was an impenetrably black vertically oriented rectangle that spanned the entire height and width of the container. At the threshold to the structure visitors often hesitated before going in. Once inside the container viewers were submerged in complete and total darkness.