Check the chapter "A Knife in the Dark" (in "Fellowship"). When Frodo
puts on the Ring, he sees five of the Nazgul clearly; the Witch-king
is among them. And yes, they look human.
By way of comparison, see "The Battle of the Pelenor Fields", where we
see what the Witch-king looked like to a mortal who wasn't wearing the
Ring. Of course, he didn't look like much, since he'd long ago faded;
JRRT describes him as "a shape, black-mantled, huge and threatening."
--
Andrew Solovay [PGP public key available on request]
"Cottleston, cottleston, cottleston pie."
-- Pooh
A Nazgul is a human who exists mainly in the spirit world (when Frodo is
wearing the Ring on Weathertop, he sees what they really look like). To
people in the normal world, they are almost completely invisible, except
perhaps for the eyes (Witch-King at the Gate of Minas Tirith). What they
do not have is a skull-like face, as portrayed in David Day's "Tolkien
Bestiary". They do have bodies, even if invisible; it took effort to put
a sword into the Witch-King.
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John Elliott |BLOODNOK: "Why have you got such a long face, Seagoon?"
m93...@ecs.ox.ac.uk |SEAGOON: "Heavy dentures, Sir!" -The Goon Show
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Read the chapter, A Knife In The Dark, for a description of the Witch King.