Page 206. " The Terrazzo Garden "

 Terrazzo was originally invented by construction workers in Venice, Italy as a low-cost flooring material made of marble chips and other aggregates set in clay. Production of Terrazzo became much easier after the 1920s introduction of electric industrial grinders and other power equipment that gave a highly polished finish. The use of Terrazzo extended to the outdoors, for walkways, patios and terraces. It became a popular feature in gardens, known as Terrazzo gardens.

'Terrazzo' is Italian for 'terrace' and 'terrazzo garden' may also refer to a terraced or roof garden.