that a strawberry-flavored mousse tastes ten percent sweeter when served from a white container rather than a black one;
that coffee tastes nearly twice as intense but only two-thirds as sweet when it is drunk from a white mug rather than a clear glass one;
that adding two and a half ounces to the weight of a plastic yogurt container makes the yogurt seem about twenty-five percent more filling;
that bittersweet toffee tastes ten percent more bitter if it is eaten while you're listening to low-pitched music.