ok--the title has been somewhat despihered by countless other people, and I'm certian I'm probably just thinking of something that was thought of a while ago...but how about this:
lateral means beside or across or something along the lines of that. Lateral muscles are across your body, laditude runs paralell to the equator...find your own examples. So its very plausible to think of the album as a running comanion to something else ending up in the same spot, just running a different course to get there. what its running paralell to is pretty much up to your own mind...it could be Ænima, it could be jung, it could be jesus.
another thought, going off the idea of lateral is that its a crossroads to another event/album/emotion.