Vastu shastra recommends the use of natural materials. My teacher, Dr. V. Ganpati Sthapati in Chennai said the best materials are “mother’s” That is Mother Earth: Earth, stone, wood. These materials are most resonant with Earth energy, most compatable. The space will have the most silence. Also, Vastu Science offers a kind of deep ecology because we are building a structure that has the mathematics to vibrate in harmony with Earth and Cosmic energy structures.