How do you imagine the interior of the Tower of Ghenjei? Will you just immediately appear in Finnland at some point, if you just enter the Tower (opening it with the bronze knife), so that their isn't a real interior. Or will there be an empty interior of the Tower except for a diffuse lightsource and a doorway inside that will actually bring you to Finnland. BS mentioned once that he named a special "Door of Postuma (?)" at Twitter for ToM: "Paul Postuma, I named a door after you in ToM. The door will make sense in the book’s context. Remember, I usually keep posts about unpublished WoT books intentionally obscure." This could have inspired the AoLers to make similar doorway ter'angreal. Or will there be more things in the Tower, maybe at least some corpses with their possessions?

This leads to the question, who actually built the Tower of Ghenjei? A person named Ghenjei? The people of Ghenjei? The Finn themselves (though they can't affect the Real World)?

RJ RAFOed that question. It seems unlikely that simply AoL channelers built it, since you don't open it with the OP, but with a bronze knife drawing the symbols of the Finn; seems rather like a very primal method. Maybe like the Portal Stones, which were according to Verin made by "those who knew the Numbers of Chaos", it was created by special people in the 1st Age to reach the Finn world. Also, according to RJ "you might say that mortals made the Horn of Valere. They certainly weren’t gods." Doesn't sound like normal humans, though.