(a) Nine particles are drawn from a probability distribution p, corresponding to a pure state, but they are not yet observed. (b) We look at particles 2–3, which turn out to be both red, and then look at particles 6–7, which turn out to be both blue. (c) Had we drawn particles 3–6, we would have expected them to be of same color, but this is in contradiction with the “experiment” of row (b).