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Schrödinger's cat (1935) presents a cat that is in a superposition of alive and dead states, depending on a random quantum event. It illustrates the counter-intuitive implications of Bohr's Copenhagen interpretation when applied to everyday objects.[1]
A thought experiment is an imaginary scenario that is meant to elucidate or test an argument or theory. It is often an experiment that would be hard, impossible, or unethical to actually perform. It can also be an abstract hypothetical that is meant to test our intuitions about morality or other fundamental philosophical questions. The German term Gedankenexperiment was utilized by physicist Ernst Mach[2][3][4][5][6]