 Once more, Descartes identifies the angle at which the less brilliant red appears, this time at K, closer to the top of the flask, and observes that, by slightly enlarging the angle, other, weaker colors appear, as they do in the secondary rainbow. He concludes, based on these observations, that if the air were filled with drops of water, these drops would produce the same colors, relative to the same angles, effectively producing all the colors of the primary and secondary rainbows.