The Imperial WallEdit
In Fisheye Placebo ch0 part 7 while going to Vance's university, Vance asks about the wall as they have been driving by it for a while already. In response to this question, Vance's dad says that Vance should know about how the Imperials built a wall and how they tore down about 10% of it.
The wall was built to seperate the slums of their country from everybody else. Vance's family sees a break in the wall giving his family a glimpse at the terrible truth about poverty in ch0 part 7.