Descartes
... To start his experiment, Descartes begins to doubt his five senses: touch, smell, sound, taste, and sight. ... In his second meditation he goes about explaining the “Cogito” point, meaning “I think, therefore I am”, but Descartes uses it as “I am, I exist. ... In contrary, Descartes points out that even if evil is present, there is surly one thing no one can trick him about; his own presence. ... Another thing Descartes uses, as an example is wax.