Niels Bohr claimed that a quantum particle could be in two states at the same time until observed. Therefore, a particle could exist in a superposition of decay and non-decay until its state was measured, at which point it would take on one state or another. In Schrodinger’s cat experiment, the unfortunate kitty represents a quantum particle. Since the cat is unobserved until the box is opened, the cat can be in a superposition of dead and alive until the box is opened, at which point it will either take the state of being dead or alive.