TobyBartels comments on [FINAL CHAPTER] Harry Potter and the Methods of Rationality discussion thread, March 2015, chapter 122 - Less Wrong
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The ironic thing about those exceptions is that bringing in Barbour's timeless physics is arguably itself one of the errors. In Harry's explanation of how he was able to perform partial transfiguration, there's nothing from Barbour except the phrase ‘timeless physics’; Harry's explication of that, as enforcing a relationship between separate time slices rather than performing a change, is the standard idea of a block universe, going back at least to 1908.