The very reason the rational world appears more solid than this world is it's an entirely human creation. When people tread the halls of rationality they are impressed by the regularity of the columns, the smooth marble, the sureness of the foundations, but the churning cosmos is completely indifferent to this fine building and regularly intrudes on it. This extends to the oft-cited examples of casting bridges across expanses using mathematics, and the design and implementation of computers. There's no permanence to the so-called eternal laws holding up the bridge, and there's nothing logical about digital computation. The brain is an organ at the service of life, it is not "above life" as it likes to tell itself. The moment we came to believe we were rational creatures was the greatest act of self-deception in human history.