The layout of the house determines the material of the stairs. Flower pots, beds, tables, everything is closely related. It can't be solved by just one staircase. Look at the five elements of the item first; Derive the corresponding six precious lives, seven stars looking at the sky, local latitude and longitude; Gossip determines the fate; The room is called Jiugong. The geomantic omen of the house is understood like this. I hope I can help you.
By the way, if everything is a foregone conclusion, then the setting of your stairs can be regarded as a grid, and the five elements can look at the surrounding objects before deciding what materials to use. The attributes and placement of items are all arranged according to gossip.