To understand the concept of Vastu Shastra, one must need to understand Vastu Purush and the 45 Energy Fields of Vastu Purush Mandal present in any place where human lives
When the foundation stone is laid & construction work starts the core energy field starts developing. In Vastu, we call it Brahma energy. At the time of creation, the color of this energy field is reddish Golden. Once the energy is completely developed, i.e. After completion of the building, it turns white color. This center also known as navel(naabhi)