IANAPhysicist, but I think T-duality in String Theory [1] also makes distances "illusory".
"If string theory is a correct theory of Nature, then this implies that on some deep level, the separation between large vs. small distance scales in physics is not a fixed separation but a fluid one, dependent upon the type of probe we use to measure distance, and how we count the states of the probe." [2]
Brian Greene also explains why in an accessible way in the Chapter 10 of The Elegant Universe [3], which I recommend.
[1] https://en.wikipedia.org/wiki/T-duality