At last, the great main space (formerly the Turbine Hall) at Tate Modern has an installation worthy of its gargantuan promise. Like some reconstituted Giant's Causeway, the sculpture spreads over, and above, the entire space. The medium chosen by the sculptor, Rachel Whiteread, is composed of simple white boxes of polyethylene. This has enabled her to create a kind of polar, or lunar landscape, which is best described as ‘sublime’ in all its lucid severity, and yet it is also described by Tate Modern as ‘labyrinthine’ in terms of its impact on spectators at ground level. One of the advantages of this part of Tate Modern is that visitors can look down on the whole work from above, as well as wander in a Wordsworthian coma around the base level - although it is not recommended to scale the white cardboard heights. It promises to be a massive photo opportunity for camera carriers. The sculpture, now opened to the public, will be displayed until immediately after April Fools' Day (1 April).