More use cases for nondescript resources

nondescript is a funny word. Quite sure I did not catch its correct meaning when I first heard it. It has no real equivalent in French. Indescriptible is too strong, it refers to something too extraordinary to be described, whereas nondescript is actually too ordinary to deserve a proper description. Or is it that any description would miss the point? The free online dictionary says : Lacking distinctive qualities; having no individual character or form. Maybe in fact nondescripts remain such because those features which makes their individuality are too subtle to be captured, or this capture would be useless.
Anyway, let's take them as they are : no description. What does a nondescript look like in RDF? Well, easy, it's a resource with no description. No type, no identity, no properties, certainly not even worth a URI. A blank node with no property whatsoever. Rings a bell now? After the previous post, I've come out with more use cases for those nondescript resources, and how natural language uses them as binding points. Examples

John walks through the neighborhood where Ann is working.

:John :walksThrough _:n
:Ann :worksIn _:n

In The Rule of Four (currently reading) Vincent and Richard have different theses about Hypnerotomachia Poliphili. Paul prefers Richard's thesis.

:Vincent :hasThesis _:tV
:Richard :hasThesis _:tR
:Paul :prefers _:tR

Now the "Class or Concept" example comes naturally as just another case

a:Restaurant a owl:Class
b:Restaurant a skos:Concept

a:Restaurant :represents _:x
b:Restaurant :represents _:x

Cloud hidden, whereabouts unknown. (Similar stuff in the early '70s)