 Finally, Broad notes that (assuming one wishes to think of passage as like qualitative change) the acquisition and loss of (say) presentness by an event would itself be an event, a second-order event, in the history of a first-order event. Since the first-order events are, by hypothesis, durationless, it is tempting to suppose that this history takes place in a second temporal dimension. We find ourselves again launched on what looks to be an infinite regress of temporal dimensions.