Andre's metal floor sculptures are intended to be walked on. This example is one of a series made between 1967 and 1975, each using a different metal. The 12-inch magnesium squares are arranged into 12 rows of 12, to create a larger square with a total of 144 units. Moving over the square brings an awareness of the texture of the magnesium plates. Andre accepted that the surface of the work would be altered by visitors' footsteps, observing that it 'becomes its own record of everything that's happened to it'.