The usual example for that is drawing dots on the surface of a balloon. If the balloon expands, all the dots get apart; you don’t have to be at an specific dot to measure the rest getting apart.
In practice that involves weird looking equations involving lots of auxiliar dimensions (beyond 3d).
If I start out as a 1/16" inch dot and the nearest 1/16" inch dot is 1 inch away .... as the balloon is blown up and expanded, my 1/16 inch dot expands to 1/8, as does the nearest dat ... and the one inch gap expands also to 1 1/2
(of course none of this is in mathematical correctness, but the principal is the same)
My 1/16" eye perceived the 1" distance and called it 1"
My 1 1/8 eye perceived the 1 1/2 distance .... and called it 1"
Because that's what I had scientifically observed when I was a 1/16 inch dot.