"We don't need a list of rights and wrongs,
tables of do's and don'ts;
we need books, time and silence.
'Thou shalt not' is soon forgotten,
but 'Once upon a time' lasts forever"
-PHILIP PULLMAN
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Doctor Who seems to like the imagery of being on opposite sides of a wall, with your “heart’s most desire” unattainable on the other side. It’s a rather sad concept and reminds me a bit of how Lyra and Will turn up at the end of The Amber Spyglass.