I saw a really good demonstration of this once, but I can’t seem to find a video of it.
Basically imagine a rubber tube with 4 balls equal distance apart from each other.
–0–0–0–0–
If you stretch the tube from both ends all of the balls move an equal distance apart.
----0----0----0----0----
There is no one ball that is the center or the starting point. However if you focus on one ball while stretching it will seem like the others are moving away from it. But in reality they are all moving away from each other at the same rate.