  The Extensional approach carries no such implications. For on this view, a typical specious present is itself temporally extended, and its parts succeed one another in time in just the way they seem to. Here vehicle and content share their temporal properties. Or as Foster puts it, ‘we have to take each experience to extend over a period of real time in a way which exactly matches the phenomenal period it presents.’ (1991: 249) However, while this precise matching may well be the norm, Extensional theorists will want to find room to allow the apparent (or subjective) duration of an objective interval to vary: a few seconds spent waiting at traffic lights can seem like far longer. This sort of discrepancy amount to another respect in which it is possible for content- and vehicle-properties to differ. (For further discussion see Section 1 of the supplementary document  The Specious Present: Further Issues.)