Ah, only black and white squares are used right now. Icons like stairs don’t do anything unfortunately. Mainly because a square represents a whole room and we wouldn’t know which direction they face. They’re just there for planning like…
…and possible future use. I should make that more clear.
I might have made them represent a blank square, so we can place our own stairway easier. I haven’t found a practical way to automate stairs. Some things are just easier to do manually.
Windows and doorways are a WallVariant.