It is always evening here, unless it is morning, night, afternoon, tea-time, or other.

 And what is it to be evening if not nothing else but evening?  

Structuralism agrees, saying, "yes." (And what does "yes"  signify, outside its relation to "no"?)   

The deconstructionist does not disagree, saying essentially nothing.

 "Nothing?"  King Lear demands.  "Nothing will come of Nothing. Mend thy speech a little, lest thou may mar thy fortunes!"