Full Idea
If a plural variable is said to have not a single value but some values (some clothes), then a non-count variable may have, more quirkier still, some value (some clothing, for instance) in ranging arbitrarily over the scattered stuff.
Gist of Idea
If plural variables have 'some values', then non-count variables have 'some value'
Source
Henry Laycock (Words without Objects [2006], 4.4)
Book Reference
Laycock,Henry: 'Words without Objects' [OUP 2006], p.135
A Reaction
We seem to need the notion of a sample, or an archetype, to fit the bill. I hereby name them 'sample variables'. Damn - Laycock got there first, on p.137.