Let's say the universe exists as a collection of related static 3-d spaces, like in Julian Barbour's book The End of Time. Nothing ever actually moves. The illusion of movement comes from moving from one of these spaces to another which is closely related to the previous one. It's similar to the way flipping through frames of a film generates the appearance of movement. OK, now in Barbour's picture you (or your consciousness, or focus of attention) somehow would have to move from one frame to another (unless you never move and just think you do, but that's another story). Also, these frames must physically exist, and be physically seperated from each other. Barbour doesn't seem to address this to my recollection, but what if they physically existed as 3-d spaces embedded in a larger 4-d space? Then, moving from one of the 3-d spaces to the next would require movement along the 4th physical dimension, and also would generate the illusion of time. That way, time is literally "moving into the 4th dimension" to the next frame. Only it doesn't feel like you're moving because the place you move to is almost exactly the same as where you were (i.e you're still sitting at your desk even though you're really moving), and you feel no acceleration because you are moving at a constant velocity. I am just wondering if this conclusion follows from Barbour's assumptions, or if it has any application elsewhere. Any thoughts? Could the velocity of this movement be changed? What if you are also rotating? What would that do?