This dualistic supposition leads into the ‘many-universes’ theories, whereby the universe would split into two parallel realities, one with a dead cat and another with a living cat, or many more, as these are not the only possible outcomes of the experiment. The cat could have moved the vial and survived, irrespective of the condition of the radioactive substance. The hammer might not fall, but the cat dies anyway because of some unseen illness. The cat could escape the box. It is the multiplicity of possibilities that causes some to shy away from applying quantum physics to scenarios larger than a single particle-wave.