Wollheim's account in 'Art and Its Objects' establishes that perceptual properties belong exclusively to particular instances, not to the type, making 'extended' attribution explanatorily idle rather than genuinely descriptive.

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Art and Its Objects(the specific philosophical work being discussed): A famous book by Wollheim about what art is and how it exists—like whether a painting is just the physical canvas or something more.
Explanatorily idle(in philosophy): Unable to actually explain or account for something; basically doing no real work in solving a problem.
Extended attribution(the kind of description being criticized as unhelpful): Saying that a quality applies to a whole group or type of things, rather than just individual examples.
Genuinely descriptive(contrasted with being explanatorily idle): Actually telling us something real and useful about what something is like, rather than being merely superficial.
Particular instances(where perceptual properties are said to belong): Individual, specific examples of something—like one specific painting, rather than paintings in general.
Perceptual properties(what kinds of characteristics are being discussed): Qualities of something that you can directly see, hear, or sense—like the color red, a rough texture, or a loud sound.
Wollheim(the philosopher being cited): Richard Wollheim was a 20th-century British philosopher who wrote influential work on how we understand and experience art.
type(Epistemic type spaces in multi-agent belief systems): A structured object of the form ⟨f₀, f₁, …⟩ containing some fₙ for every natural number n, used to represent an agent's full hierarchy of informational attitudes.

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