Are you confused by Ahnonay's "time travel" illusion? Wonder how those rotating spheres work? Can't figure out how we managed to get into the fourth version? Don't worry, this Age had me stumped for a long time too when I first played Path of the Shell.
In this video, I use an animated diagram showing the position and movement of the spheres as you use the linking book on the pedestal, the lever in the tower, and the lever in the control center.