In the Orstein and Smough boss room, there is a missing statue next to the statues of Gwyn and Gwynevere. From a lore perspective, it is widely believed to be the statue of the firstborn son of Gwyn. Because he had his status as a god revoked and was written out from history, it would probably make sense that they'd remove statues of him.
However, it was discovered that the missing statue still had a 'presence', and was possibly just invisible, because you could shoot arrows at it and hit something.
The 3D Map Viewer reveals that all the statues there have simple rectangular boxes for collision data, including the missing one:
And a view of the single meshes shows nothing:
What seems most likely: They probably designed the room to have three spots for statues and included rectangular blocks of collision data for whatever was going to be put in there. Then they only put in two statues and forgot to / didn't bother / didn't care about the collision data for the unused statue. I'm not saying the missing statue is unintentional from a lore perspective, but I am saying that there being an "invisible statue" with collision data is almost certainly unintentional.
Without any in-game evidence to support theories of a possible meaning for the invisible statue or how it might reveal who that statue was supposed to be of, I think it's basically debunked and the burden of proof now lies on anyone who thinks it may still have a use or hidden meaning. Not everything in the game is intentional.
screenshot credits go to Ellemennohpee and TheDarkLantern
Last edited by retro on Mon Jul 30, 2012 8:45 pm; edited 1 time in total (Reason for editing : typo)