This installation by Yayoi Kusama, called "Aftermath of Obliteration of Eternity," uses hanging lights in a room paneled with mirrors, giving it a faux-infinite view of lights that stretch on and on. Check out more cool light installations in the via link!
Milan-based design group Carnovsky created an installation that's a little different than the norm. The group painted three separate wall murals using the primary additive colors (Red, Blue, Green) combined with lights of the same color within the room. Cycling through the lights gives you three entirely different looks in the room as murals become more or less invisible. Check out the views in the gallery below, and more information in the via link!