Each division of time is represented as a separate circle, with circles for the month, calendar day, day of the week, hour, minute and second.

The Vignelli Circles map, which was published in December, "definitely has something that the original Circles Map doesn't, in a style much closer to New Yorkers' psyche," he tells us.

Then comes the circle of immediate families, whose husbands and wives, fathers and mothers, sons and daughters leave home for days and weeks at a time and whose fate is often unknown.