My understanding is that the Ring, when worn, takes the wearer into the spirit world. Thus, he becomes invisible to those in the material world, but visible to those already in the spirit world, such as the Ringwraiths.
Presumably, Sauron, as a Maia, was able to exist in both the material and spirit world, and so did not need the Ring to enter the spirit world. Why therefore did he imbue the One Ring with an ability that he did not need? Or was this just a natural side-effect of Rings of Power?
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