Dualities are the most elementary of comparisons, and are the easiest for the mind to comprehend in that total opposites are brought to attention. These opposites subconsciously provide one with a deeper insight of the material and consciously entertain. In Ray Bradbury's Fahrenheit 451, many dualisms are included both within Montag and in the outside world that provide 180 degree flip-side views, giving the book further depth and inner meaning.
Within the many layers of Montag lay several opposite sides. For example, Montag is a fireman who burns books for a living but at home, spends time reading novels, poetry, and o