Samsara is often described in terms of the six realms. The deluded person falls from one world into the next.
The Chinese called Samsara, the passing between the worlds of experience–Tao, The Way; the same term used by them for Awakening. They didn’t do this because they were short of words.
The practitioner travels between realms, and each realm is the scenery of his life at that moment. He is not caught. He does not fall. Although he travels, he does not choose to go. He does not choose to stay. The deluded person cannot travel. His feet, as it were, are stuck fast to the ground of each realm, and that ground is like a constantly collapsing building.
When we sit, it is as if all the worlds are travelling through us, like clouds through mountains.