In the Quantum World, Even Points of View Are Uncertain | Quanta Magazine

In the Quantum World, Even Points of View Are Uncertain

An illustration of a man with an apple and looking at his reflection, in which the apple has a bite taken out of it, evoking the way that quantum reference frames can affect the perceived order of events.

The reference frames from which observers view quantum events can themselves have multiple possible locations at once — an insight with potentially major ramifications.