distance from each side

Distance will be observed from both side, because distance can only exist when there is two different point.

But of course depending on each experience or value, perception of distance differ.
So even if it seems they are discussing about same distance, sometimes they discuss totally different thing.

One of the idea is to hire somebody else for fare judgement for that distance like universal code, but for our general daily life, we need to rely on our own intuition or somebody's advice.

There would be no correct answer, which distance would be correct. Rather, at least, to be sure that distance can be different from view point by view point is basic requirement for all persons for each matter.

And what kind of happy misinterpretation occur will save the world, I would like to believe, though such idea is a childish dream I really know.