At the 24th Bienal de São Paulo, 1998, Eliasson created a surface of ice that seemed to extend through the glass facade of the Oscar Niemeyer biennial pavilion into the plaza outside. The texture of the two ice surfaces reacted differently to the interior and exterior environments and to the traffic of people walking across the ice. The installation, documented here in São Paulo, was later adapted and exhibited in Kassel, in 1998, and Karlsruhe, in 2001.