In the world of Tolkien there are two worlds mentioned: the Seen and the Unseen. The wraiths resided in the Unseen, logically because they cannot be seen; you only see their form, their silhouette. As Ereinion pointed out Frodo saw them clearly when he put on the Ring, thereby entering the Unseen world. Remember Glorfindel as well, who became 'radiant' while the others were grey and foggy. Gandalf said he was one of the mighty of the Firstborn, both in the Seen and the Unseen worlds. Any thoughts on that?
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Do not meddle in the affairs of wizards for they are subtle and quick to anger.
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