So basically mirror in author's view presumes two groups with the same set of beliefs, they agree on the phenomena, they agree on validity of certain laws, they even agree on the ultimate outcome. They only differ on the nature of the outcome, one group thinking it's good, one group thinking it's bad.
For me, that's not actually a mirror. A mirror effect will change everything to 180 degrees, not just some parts.
A figure of speech is not a formula which must be literally interpreted. Sometimes doing so is interesting, but I don’t think this is one of those times.
For me, that's not actually a mirror. A mirror effect will change everything to 180 degrees, not just some parts.