The opening stanza 'I wander thro' each charter'd street' sets the tone and setting for the remainder of the poem. The repetition of the word ‘charter’d’ shows how legally defined, mapped out, or in this case, confined the place is - Everything is already decided, and is subject to government control - there is little room for freedom or imagination. This particular spot is near the Thames River – which too has been ‘charter’d.’ 'wander' and 'charter'd' are juxtaposed because 'wander' suggest freedom and carelessness where as 'charter'd' seems controlled