Let's say you take the Earth and put a road around the equator of the Earth so that you could drive around it. Now you set your cruise control for say 200mph.
Then let's say we take the Earth and everything on it and copy it and then divide all mass by 1/2 and put it in a parallel dimension; so we have two existing representations of Earth and you are going 200mph in each Earth and each Earth experiences the exact same occurrences. So an observer on both Earths experiences the same things.
Assumption: Time is linear.
Implications of assumption: If time is linear and both Earths have the exact same experience, then you must be going the same speed on both Earths because speed is dependent on time.
Problem: From the bigger Earth's perspective, the car on the smaller Earth is traveling at a smaller speed. And from the smaller Earth's perspective, the car on the bigger Earth is traveling at a greater speed, but they are experiencing the exact same realities from their perspectives, but have different relative speeds, suggesting a distortion between how time is perceived in one versus the other. So how do we interpret this? And is this the basis for Einstein's theory of relativity?
I want to say that this proves that time can't really be linear, or perhaps is relative. What would you say?