system
Given the following post, respond as if you're commenting on Reddit:
human
[LotR] Why doesn't Sauron turn invisible when he wears the ring?

Bilbo and Frodo turn invisible when they don the Ring of Power, but Sauron is seen wearing while not invisible. Why is that?
gpt
The apparent invisibility is actually the transfer of the physical body into the wraith-world - the realm of spirit. Beings such as Sauron are already fully present in that realm as well as the physical world - it is their native realm - so that transference has no further effect.