The two midgets: ‘Is’ and ‘Not’. Two words unparalleled in their ability to create mischief. I’ll get to the first later; for now, the ‘Not.
Not; Nothing; Nonsense; Never; Neither; Neutral. They all come from the same gene. One big mischievous joint-family. [I know of no word that more annoys a trained Logician than the word ‘Not’.]
And here is how the mischief begins:
North America and South America together make up the Americas. But North America and Not-North America?
We are not quite sure what exactly is: ‘North America and Not-North America’.
‘Not quite sure?’ That’s right. Not quite sure.
And not quite sure what exactly: ‘Not quite sure’ means.
Nor the above sentence.
[Do you smell the Self-Loop, the simmering Self-Negating Expression?]