Full Idea
Many patently complex concepts don't even have a prototype structure, such as 'Chairs that were purchased on a Wednesday'.
Gist of Idea
Many complex concepts obviously have no prototype
Source
E Margolis/S Laurence (Concepts [2009], 2.2)
Book Reference
'Stanford Online Encyclopaedia of Philosophy', ed/tr. Stanford University [plato.stanford.edu], p.8
A Reaction
[The example seems to be from Fodor] I disagree. If we accept the notion of 'refining' the prototype (see Idea 11135), then the compositionality of the expression will produce a genuine but very unusual prototype.
Related Idea
Idea 11135 Complex concepts have emergent properties not in the ingredient prototypes [Margolis/Laurence]