Linear time. That post Seer just posted, I think the old texts especially the sophia about how her light was stolen by yaldaboath and her spirit/soul was splintered is really about the illusion of time.

past lives, present, and future lives all splintered and shattered into pieces. Us being in linear has kept the other parts/aspects hidden by the veil of time. And with that memory is hidden.
That is the illusion.