i dunno, i thought this was interesting:
http://teamikaria.com/hddb/classic/introduction.htm
learned a bit. its also interesting that the 2d world can be represented with 2 world axis and a third one for time. so time in 2d space would effectively be moving through the 3rd dimension, and seeing this, would more or less be "tubes" in a 3d world
does that mean time is essentially our universe moving through the 4th dimension?