In the early 1960s Haacke produced works that explored the interactions of physical and biological systems and their natural processes. Although related to the cube form adopted by minimalist artists, Condensation Cube departs from the notion of the static object animated only by the interaction of the viewer. It consists of a sealed Perspex box filled with a small amount of water. Condensation begins to form and to run down the sides of the box, changing according to the ambient light and temperature. The work’s appearance therefore depends upon the environment in which it is placed.
http://www.tate.org.uk/art/artworks/haacke-condensation-cube-t13214
http://www.tate.org.uk/art/artworks/haacke-condensation-cube-t13214