“the houses opposite Cutting the ski with one long line of wall Like solid fog: far as the eye can stretch”
metaphorical “wall” foreshadows speakers late comparison of city to “prison” as urban life, image implies,traps people
“solid fog” further links citys buildings with its pollution + gloom
“cutting”= industrialisation + urbanisation are violently harming natural world
Enjambment of lines 3-4 “stretch” across string of houses that create “longline of wall”
caesura after “fog” = further entrapment