Janie says: I think you may have the cart before the horse. Seems to me that rational thought and logic are methods of thinking that can help us understand how or why 'things' happen and to predict or understand the interaction among different 'things.'   
Things do cease to function. Using logic or reason is/are tools for understanding the processes involved, but are not the processes.

Could it be that the cart and the horse are interchangeable? I'm sure there are those here who will disagree, but I think it's almost always true that 2+2=4. But then, it's also almost always true that 4=2+2. Nature follows patterns, and the patterns have a mathematical relationship. And for the most part, math=logic and logic=math. One can describe the processes of nature mathematically or logically, but one can also predict the processes of nature mathematically or logically.

I'm reaching for a little bit more, and I don't know that I've got it. It seems to me that logic and math follow patterns that "work"; and that functions of nature also follow patterns that "work" beneficially most of the time, although they sometimes fail so abysmally that they cease to exist.

-Joe-