Poem analysis

i've been reading this wonderful poem by stephen spender called "an elementary school classroom in a slum"

far far from gusty waves, these children's faces,
like rootless weeds the torn hair round their paleness.
the tall girl with her weighed-down head. the paper-
seeming boy with rat's eyes. the stunted unlucky heir
of twisted bones, reciting a father's gnarled disease,
his lesson from his desk. at back of the dim class
one unnoted, mild and young: his eyes live in a dream
of squirrel's game, in tree room, other than this.

on sour cream walls, donations. shakespeare's head
cloudless at dawn, civilized dome riding all cities.
belled, flowery, tyrolese valley. open-handed map
awarding the world its word. and yet, for these
children, these windows, not this world, are world,
where all their future's painted with a fog,
a narrow street sealed in with a lead sky,
far far from rivers, capes, and stars of words.

surely shakespeare is wicked, the map a bad example
with ships and sun and love tempting them to steal-
for lives that slyly turn in their cramped holes
from fog to endless night? on their slag heap, these children
wear skins peeped through by bones, and spectacles of steel
with mended glass, like bottle bits in slag
tyrol is wicked; map's promising a fable:
all of their time and space are foggy slum,
so blot their maps with slums as big as doom.

unless, governer, teacher, inspector, visitor
this map becomes their window and these windows
that open on their lives like crouching tombs
break, o break open, till they break the town
and show the children to the fields and their world
azure on their stands, to let their tongues
run naked into books, the white and green leaves open
the history theirs whose language is the sun.

when it comes to analysing the poem though ^^ i'm a little lost as to what the diction + structure + rhyme scheme (if any) + type of poem it is. if anyone could help me with cossonants and vowels, that would be awesome <3