Manasara 30.45

30.45

nagaragrāmādisarveṣāṃ kalpayecchilpivittamaḥ
acalaṃ ca calaṃ caiva dvidhā sopānamīritam

and in all cities, villages, and the like, the best of artisan-architects should design them. / Staircases are said to be of two kinds: immovable and movable;