Dr Carl Sagan
Whenever the topic of multidimensional existence comes up, which is for me surprisingly often, I always remember how Dr Carl Sagan described it in his Cosmos television series. He described in terms of a two-dimensional creature imagining a three-dimensional universe. From what I recall he referred to this as “Flatland” – as you would.
This is a useful analogy and has helped me to visualise many spatial problems I’ve encountered in my professional life.
I’m currently writing a novel length piece of fiction in the alternative history genre. And being a little pedantic about such things I felt the need to theorise about how the entity, who was the catalyst for this version of the universe, lived. And, to this end, I’m using a similar analogy.
We three-dimensional creatures may be able to move through our universe at will but there are physical limitations. It is not like we can move/jump to any point on our planet in an instant, let alone move about the universe. For me living in Australia to jump to the UK takes time and effort in both physical and monetary terms. Similar limitations should apply to an entity living in three-dimensional + time (3D+t) universe i.e. it can only move so far on a whim. Greater movement would require a corresponding increase in effort and patience.
And also, the faster I choose to travel about this three-dimensional universe there is a corresponding increase in risk to my three-dimensional body. So I expect that a similar increase in risk would apply to a creature jumping about in a 3D+t universe.
Taking this analogy a step further, each time I travel to London I don’t run into myself; it is a different London – irrespective of how precisely I attempt to position myself in the exact spatial location. Many people have speculated that with each decision we make a new parallel universe springs into existence. I don’t think reality
will be… is anything like this. There is not a new London, it is just a different one. So the 3D+t entity can visit a new time/place that it has visited previously but it doesn’t “run into” itself.
A few conundrums to end this post for now:
If a 3D+t entity lives outside time, then can it ever have a first time?
Every moment that ever was is now. Or, when each intersection of a moment in a place occurs, it is gone forever and exists only in our memory e.g. the 3D+t entity could remember being at this time/place but that is as close as it gets to “running into” itself.