This thing is called kinetic wall. Made with 250,000 aluminium panels that are sensitive to wind currents, its 53,819-square-feet surface (5,000 square meters) looks like a vertical lake. Watching it in motion is a surreal experience:

The video above is from a smaller previous project. The wall in the image is being made by Urban Art Projects and artist Ned Kahn for the Brisbane Airport. It will completed next to the new domestic terminal short-term parking building in 2011. [Archdaily]