starkid wrote:
A 2d lifeform is a nonsense concept, but even as a matter of fiction, there's no reason to believe that the lifeform's sight would be restricted to two dimensions.
Furthermore, time is nothing like physical dimensions. This idea of time as a dimension has gotten out of hand, honestly. "Dimension" is not the same as "physical dimension." In math and physics we worked with time, temperature, pressure, and other variables as dimensions. "Dimension" in this sense is a purely mathematical concept, basically just another word for "variable". Any quantity (physical or not) can be represented as a dimension.
Time can be expressed as a dimension. The passage of time is the gradual pathway to increasing entropy within the universe. In that concept, it can only go forward overall. I see it as an effect of a symmetry operation upon our environment, whereby one could plot disorder in a 3-D lattice as a function of time. That is the same effect if you overlap 3-D slices of our universe on top of each other and look at the intersection points. You may not agree with what I have just typed, but that is my perspective on the subject.
Albert Einstein was not wrong in using space-time to describe effects in many of his explanations. Lately some physicists seem to be trying to discredit his research, yet he has a long track record of being right on the money on so many things. That particularly bothers me that some cannot accept him for knowing things that they struggle with, because it does not fit their models of how the universe works.