The spotlight of Sauron is the cheesiest thing PJ could have ever done. LOL, why don't they just sound the alarm and call SWAT (Sauron's wicked a** trolls). Anyway on to the "Eye of Sauron," since I've shown my extreme hatred towards the whole "spotlight" thing.
Most people have this covered, it was just to symbolize Sauron was watching you, even if you were a ring-bearer or not he was watching. Glorfindel points out in Rivendell,
Quote:
Council of Elrond
"But in any case" said Glorfindel, "to send the ring to him (Bombadil) would only postpone the day of evil. He is far away. We could not take it back to him, unguessed, unmarked by any spy...
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That is just one quote from the book of Sauron's "watchfullness." He has his 9 riders also going around searching for the Ring "watching" for him, well did, they're horses were drowned in Bruinen.