I'm playing in DF2010 for 3 or 4 days. Read a lot at DF's wiki. Now I'm prepairing for the 1st attackers. I'm gonna build a tower with underground way to it. So I need to understad clearly, how to build walls.
Sometimes I need to build wall inside my fortress. But I still don't get meaning of all the icons. https://dwarffortresswiki.org/index.php/Tilesets hadn't help a much. Now I'm very confused of these three of them. They all are in places, where I wanted to build walls.
— — seems to be the constructed normal wall from shale (the only stone I have now)
— — but what are these? if they are unfinished yet walls, why do they have different view, and why
Wall, if they both must be walls?
What are these two?