[Morzan29]

Though many here have theorized against the Eye as being Sauron's only physical form, I would like to mention a curious idea that has come to mind. Imagine Sauron as the Necromancer having a wraith-like form in the Hobbit book but afterwards returned to his homeland of Mordor to build his armies and regain his power. I believe fully that the Eye is his shade's form manifested. No matter what Smeagol said of his torture in Mordor, this Eye is the form in which Sauron takes shape since any spirit of his order (like Gandalf) can choose their body. The Eye doesn't bark around orders to every Orc, man, and slave under his control. That would be rediculus. Much like any king or lord, his advisers do the dirty work and speak for him on common errands to his subjects.
This body he has taken is not simply the Eye though. Sauron's mouth (his top human errand boy) is a speaker to his army and even talks to Aragorn on the battlefield since that point is an important moment that the direct speaker for Sauron must be at. Maybe the Mouth is the only thing that speaks telepathically to the Eye inside the Dark Tower. The Eye is Sauron! The Mouth or Sauron speaks, the Eye sees all, and what i find very cool but no one seems to notice is that the nine Ring Wraiths are his NINE remaining fingers...... This common theme of having a body parts being different characters but all a part of the bigger picture is very interesting. Sauron's power, much like any administration, is weaker without followers. The Eye is the mind. The body of administration does the mind's work. If Smeagol was tortured in Mordor by anyone besides orcs, it was the nine wraiths who could be taken as the quote by Smeagol about the Dark Lord's fingers.