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gjm comments on Harry Potter and the Methods of Rationality discussion thread, part 15, chapter 84 - Less Wrong Discussion

3 Post author: FAWS 11 April 2012 03:39AM

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Comment author: gjm 13 April 2012 06:52:21PM 0 points [-]

since Harry's magic bag responds to sign language, can all spells be cast that way [...] ?

I very much doubt it. You have to say "prior incantato" or whatever it is, not "previous spell", and "expecto patronum" rather than "I'm waiting for my protector", etc., and (at least in MoR) the exact durations of the vowel sounds in "oogely boogely" are essential for conjuring glowing bats. It seems very much as if magic is keyed to particular sounds and (pseudo-)languages. There might be sign-language spells, which might make for an interesting underexploited niche for an ambitious magical researcher, but I don't see any reason to expect any sign-language translations of spells to exist.

Comment author: Xachariah 14 April 2012 12:09:19AM 2 points [-]

and (at least in MoR) the exact durations of the vowel sounds in "oogely boogely" are essential for conjuring glowing bats

In canon you have to pronounce it Wing-gar-dium Levi-o-sa and can't cast it unless you make the 'gar' nice and long. (In the movies, it's "Levi-o-sa, not levio-sah").