Even those whose physique is robust enough are faced with the technical problem of aligning the sensual, lived experience of time with the mechanical or technological means we use to measure it. After all, we know what it is to race against the clock, when the seconds speed ahead of our perception, and we find time running short. As children, we all faced those vast expanses of time, hours that felt like slow-moving icebergs that refuse to pass, while we wait for some special occasion to come: the end of a long journey, the arrival of a loved one, time to open our presents! Adulthood itself, in these modern times, can almost be defined by the learned ability to bring together time as we experience it and time as it is measured: at least, in our productive lives. Our computer screens, with the hour showing permanently top left, remind us that we are constantly on the clock. But, even in our years of self-assured maturity, time can suddenly slow in moments of great stress, or quicken when we are racing against it.