@jgweed,
I think Bergson's duration applies to this that we experience a duration of but we can only recall discrete events 'moment'. Also this works in lingusitcs among dialect continuums.
The general breakdown is X dialect has {set of} features, at some geographic boundary a feature in the set changes, which is fairly indistinguishable except to those who speak a very similar dialect. The feature is called an isogloss. Thus a person on the north side of a river can tell someone from the south side of it, but someone from another part of the country entirely would not be able to tell the difference between the two side of the river. So while technically these dialects are discrete they are homogenous at the same time.
In the U.S. these phenomena are most easily documented in metropolitan areas of the east coast like Boston, Philly, and NY. However it happens elsewhere. Person from Salt Lake can tell the difference between a person from American Fork and Spanish Fork just by hearing them say the word fork.
When a significant number of these isoglosses change over a geographic space they tend to group into bundles, which make it easier for an outside observer to tell the difference between larger geographic areas, however they still have significant overlap. So take for example the Iberian continuum that goes from the south west tip of Portugal up through the northeast tip of france and the south east tip of Italy. The same thing happens from town to town, geographic separating featur to feature, with the added isogloss bundler geopolitical boundaries, which on a border such as that between Portugal and Spain are less of a separation feature than one might think. Although the political structure of the countries makes the language spoken on the borders grammatically seperate the phonemic structures tend to meld.
So what I'm saying with this is that seen as a whole a continuum from one end to the other shows a kline of indistinguishable isolates. One can easily tell French from Italian without knowing the languages. One cannot however easily distinguish the difference between a person in Faro Portugal from a person from Portemao. The continuum is an experience of sorts seen as a whole, like Bergson's duration. One end and the other of the continuum is arbitraily marked off in order to easily categorize the continuum as its own discrete thing. While the distrete markers in the continuum are only visible from within the continuum. Thus we are working both with the ideals of relative perspective, how we process experience, and cognitive categorization. So a continnum is simultaneously a discrete thing and an indistinguishable experiential whole.