aporia

I'm a creature of habit so this collage of wall-barrage makes me think of aporia, an impassable impossible blockage that offers no path -- and yet is where path and possibility might emerge, the only place where they might emerge.  Wikipedia has gottne pretty good on this: https://en.wikipedia.org/wiki/AporiaSo: toxics or toxicity as aporia?  The aporetics of walls and toxics?