Hoffman is an evolutionist who started out with the hypothesis that people who were better able to use sensory ability to observe reality as it really is would have a selective advantage in survival and procreation - passing genes on to the next generation.
As it turns out, all his research points to the fact that evolution has molded our senses to survival rewards and not seeing the world as it is and that the more you are able to discern reality the more likely it is that you will go extinct. The supposition is that our senses are a filtering mechanism for perceiving danger and reward and that our most efficiently brains process symbolic information we need for survival. It is a little like the way we use icons on a computer screen to access files efficiently without having to understand all the electronics and coding that actually goes into a working computer.
This has interesting implications as to the nature of consciousness and how our senses have evolved to process symbolic information as we see all around us.