#concrete.

Always seemed stupid that they put #pipes in #concrete. Everything #breaks someday. Then they gotta tear the wall up. Oh well. Not my planet

#Air gets into #everything. Even #rock and #concrete. #Wood #metal. #Silicon (#glass) #rubber #plastic #tar helps #separate but nothings per

Two inches of #tar mixed with #rocks. Below that is 6 inches of #concrete. Below that? #Dirt. #Minecraft thin layer of #reality.