Curious incident of the Dog in the Nighttime response

In the novel The Curious Incident of the Dog in the Nighttime, the main character is used as a constant form of truth, because he does not have the capacity to lie, and is shown to dislike the colors yellow and brown, which represents the part of us humans that is superstitious, and the Black Days where he just doesn't talk is almost a representation of those who believe so firmly in their horoscope that they just stay home and lay on the couch since their horoscope is bad. This is used to show the ridiculousness of the subject, as an autistic boy is shown doing things eerily similar to certain things most people do that the author has a low opinion of.