Inversion, definition of

Energy obtained from sources that are essentially inexhaustible, unlike, for example, the fossil fuels, of which there is a finite supply. Renewable sources of energy include wood, waste, geothermal, wind, photovoltaic, and solar thermal energy.

• Inversion: Steven Holl Unveils LED-lit Sculptures Carved from 21 Million-Year-Old Stone for Milan Design Week
  Steven Holl Architects has an incredible installation planned for Milan’s Interni Hybrid Architecture Exhibition. Called INVERSION, the installation consists of six void-cut limestone sculptures made from 21 million-year-old Italian stone. The LED-lit...