Even though it may be an anime, what's interesting about it is that it brings up a very good analogy of how the world and time as a whole can be perceived.
If we likened the state of reality as we perceive now as a single "World Line" (fibre making up the thread/string/yarn) and minute variances to be multiples of such world lines within a single "Attractor Field" (the thread/string/yarn itself), then we can extend it even further to show multiple threads/strings/yarns grouped together as a cluster of different attractor fields and so on and so forth. (Just as it was explained in the anime.)
Furthermore, within the anime, there was also something mentioned called the "World Line Convergence" phenomenon which causes multiple world lines within the same "Attractor Field" to converge to the same result.
To interpret it to our individual terms, in another way, it can also be related to as the occurrence of a singular (significant) event at a "personal" scale in our lives. And depending on the decision made during that event, may affect the people around us and as a result cause a switch into a different world line, but within the same attractor field.
On the macro level, large-scaled/uncontrollable events like floods, epidemics, earthquakes, tsunamis and wars, these can then be treated as some sort of convergence between the various attractor fields. From there, the decisions made by a person or multiple persons may then be the trigger to shift things into different attractor fields...thereby trickling into different world lines within each of the possible attractor fields.
Fascinating right? How the acts/decisions that we make is the eventual guide that leads us to our possible futures...like a train moving on a railway track and each shift in the track represents a decision made that results in the train arriving at different stations and different people leave and board the train at this station.
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Looking back at your own past, haven't you had any major event(s) in your life in which you could have felt that...had you made a different decision then, it might have possibly thrown you into an entirely different world?
- BuLaDiFu -