The Impact of Measuring Reality on Observation.
The double-slit experiment, which investigates whether light behaves as a wave or a particle, reveals that the behavior of individual quanta depends on how they are observed. If you measure which slit a quantum passes through, it behaves as a classical particle, but if you don’t measure, it behaves as a wave, acting like it passed through both slits simultaneously and producing an interference pattern. The experiment also shows that the observer plays a fundamental role in determining what is real, but the interpretation of quantum physics is subjective and cannot conclude whether nature is deterministic or not.