the.com/observer
Someone who watches so carefully that, in physics, looking becomes meddling.
means A person or instrument that watches, notes, or measures events without (supposedly) taking part in them.
from From Latin observare, to watch over or attend to, blending ob- (toward) with servare (to keep or guard).
Quantum twistObservation collapses possibilities into one measured reality.
Diplomatic rankUN observers may speak but cannot vote.
Sports cousinA referee is an observer paid to interfere.