“Can you really, honestly say that you do not ‘know’ the chair you are sitting in exists? Because you certainly behave as if you do.” People reflexively believe their sense impressions, and it is difficult to imagine what it would mean to not. Writing a paper on why you should not believe your sense impressions implies the existence of your writing implement or computer.

Question for the reader: when you think that something is outrageously wrong, how do you usually get there? By doing math?