Please see #386
When the mind stores or evaluates a picture or a verbal expression, it also stores its opposite for reference.
When a reference is made to that picture or expression, the mind processes it by comparing it to it's opposite.
Most people don't know this, and the Sales people earn their keep by using "tag expressions" of the form ", is it not?". If they say "this is a great car..., is it not?" timed just right, what the prospect accepts it 'this is a great car'. The "NOT" shuts down the prospect's evaluation process.
If I offended you, I apologize.
New York is where I grew up, at a time that the Hayden Planetarium and it's Zeiss Machine were world famous, and where the Christmas Show really did get into how the sky looked in March of 4 BC.