r irregular. Such
&gt; a framework
&gt; &gt; may also need to allow use of metaphorical mechanisms to define
&gt; / describe
&gt; &gt; new concepts in terms of others.
&gt;
&gt; As more accurate terms for describing the two kinds of concepts,
&gt; I would suggest "natural" and "technical".  Wittgenstein's point
&gt; was that *every* naturally occurring concept is irregular in the
&gt; above sense, and that the only terms that are not irregular are
&gt; the ones that have been artificially defined for a part