Baotou, also known as ‘the Steel City of the Gobi’, is known for its large-scale production of steel.  The lake in this photograph was built to contain the waste from the steel-making process.  Every year the lake rises higher, so the walls that contain it also have to be rebuilt.  They have been rebuilt several times over the years, each time higher than the time before.  The lake and its retaining walls serve as a poignant monument to the age of globalised capitalism.