on categories, there is also fuzzy set theory which would fit don's day and night example better because I am not sure what the prototype for day and night is.
in the semantic turn I used the category of "bird".
in the u.s. the prototypical bird is something resembling a robin, surrounet by birds we use with qualifiers: big birds birds with a red beak, etc with penguins we have difficulties ....
terry uses an abstract objectivist definition. I prefer one that acknowledges that we actually talk of catego
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On Sep 2, 2013, at 23:07, "KEITH RUSSELL" <[log in to unmask]> wrote:
> Dear Don,
>
> I like you day/night problem. I have one which is "the hand" - I call tees
> dynamic concepts or fakes - they have forms (like a coil of rope which is
> a fake) but their expressions are so varied as to make a nonsense of any
> one version.
>
> Cheers
>
> keith
>
> On 3/09/13 1:01 PM, "Don Norman" <[log in to unmask]> wrote:
>
>> One of my favorite examples is night and day. Everyone knows what night
>> and
>> day are, but try defining the boundary: there are multiple "official"
>> definitions. Most of us just accept that dawn and dusk are neither day nor
>> night but rather some in-between state.
>
>
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