If the Vīthi be found behind the house, it is known as Sāyāśravam , and if the Vīthi be found on a side of the house, such house is known as Sāvaṣṭambhaṃ . and if the Vīthi be found all round the house, the house is known as Susthitam , Men learned in house-building ( vāstu - vidyā ) speak favourably of every one of these Vīthis .