The main idea of this poem is spelled out at the end. Throughout the initial stanzas, Motion uses imagery of entrapment and imprisonment. The streets are guarded and the rooms are "sunlit" implying that the speaker understands that Anne Frank wouldn't want to be in a sunlit room, she'd want to be out in the sun. These are all things that we take for granted.
In the last stanza of the poem, Motion illustrates the guilt feelings of the speaker. Anne cannot leave,
as simply as I do, and walk at ease
up dusty, tree-lined avenues, or watch
or watch a silent barge come clear of bridges
settling their reflections in the blue canal.
The speaker illustrates that Anne Frank's simple wish, of leaving whenever she wants to, is something she was never able to do once she went into hiding. Motion is illustrating the main theme of imprisonment versus freedom, "one enduring wish ... / to leave as ... I do, and walk at ease." This is what we take for granted and what Anne Frank didn't have.
I agree. Human feelings and rights to live are common to all humans irrespective of barriers and borders. The poet Andrew Motion emphasizes the value of freedom and human right to live by focusing on the contrasting effect of Anne's bona fide imprisonment for her safety and the mental agony it produced at the child's age of enjoying full freedom. He goes on:
"Like my own [freedom], to leave as simply
As I do, and walk at ease
Up dusty tree lined avenues, ..."
Arumairathnam Sinnaiah, Sri Lanka. 03-02-2012.
thru this poem motion potrays how anne must have felt wen she lived in this small annex.the main theme is the imprisonment of anne and the freedom we have.and how all she wud have liked to do was live a normal life.
"what hope she had for ordinary love and interest"