Quote:
Letters, 153 - to Peter Hastings
I suppose that actually the chief difficulties I have involved myself in are scientific and biological — which worry me just as much as the theological and metaphysical (though you do not seem to mind them so much). Elves and Men are evidently in biological terms one race, or they could not breed and produce fertile offspring – even as a rare event
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Lobes may be different, Fordim (also, donkeys are fertile, that's mule who's sterile

), but have you seen really and explicitly 'pointy' years? What would be the purpose? I suppose the 'outer' year - auricle, is some kind of a 'sound trap' - with the function of 'catching' and 'directing' the sound in. The pointed side has no biological function in the case, while lobes may have.
On the other hand, there is also:
Quote:
Letters, 27 To the Houghton Mifflin Company
I picture a fairly human figure, not a kind of 'fairy' rabbit as some of my British reviewers seem to fancy: fattish in the stomach, shortish in the leg. A round, jovial face; ears only slightly pointed and 'elvish'; hair short and curling (brown).
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But 'slightly' pointed is not what we've seen rubbed onto Arwen's ears in the movie. My friend has 'slightly' poinded ears, if you follow me, kind sirs and ladies.
cheers