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The poem uses a lot of comparisons or metaphors. The “gusty waves” symbolize the energy that ought to be found in children. The image of the fog is an implied comparison with the bleak future of children; for this purpose the poet uses the words “painted with a fog” and closed down with a “lead sky”. The children live “from fog to endless night” and for them “time and space are foggy slum”. The exposure to education and liberation of the mind is compared to being shown “green fields” and allowed to run “azure on gold sands”.