This is a ψ-epistemic interpretation. It considers all systems as quantum
mechanical. In that setting all systems can be needle states or observers.
This will then mean a system of observers are on different paths or
amplitudes and do not share the same outcome. This is somewhat related to
This is a video of a short talk Carlo Rovelli gave on the Relational
Interpretation of Quantum Mechanics (RQM)
https://www.youtube.com/watch?v=syb3WfSGRoE
A more detailed account is given in this paper from a Royal Society meeting:
arXiv:1712.02894v5
Rovelli's RQM is an interesting
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