Fortunately, in realms such as everyday perception and theories in the natural sciences, our brains
frequently succeed in producing such systems that approximate how the world really is.
For perception, the reason for this success is evolutionary, in that human perceptual systems and their forerunners in primates and other predecessors underwent selection for organisms that function well in their environments.
The explanation for scientific success is much more cultural, as powerful methods such as controlled experimentation, statistical inference, and computer modeling have been devised only in recent centuries.
With such methods, it becomes possible to develop knowledge that goes well beyond perception without succumbing to supernatural fantasies.