Sand fills the houses, paint stripped from the walls, blowtorched by the wind.

BBC: The ghostly shore of Namibia��s Skeleton Coast

And while these works may seem ephemeral - often made from sand and mud rather than canvas and paint, their creators clearly expect them to survive beyond the next exhibition, leaving detailed instructions of how to recreate the work, and often rebuilding it themselves (as Turner nominee Karla Black did last week with her powder and make-up creation on the floor of Tramway).

BBC: British Art Show 7 opens in Glasgow