Charles Fort in The book of the damned talks about the ways to construct knowledge. He thinks that something «is» as much it excludes something else, with which however forms a continuity. Fort specifically points out that science starts by establishing definitions to turn phenomena into something real and thus getting closer to the universal: to define something needs to exclude something else. It´s clear, then, that an opinion or classification are illusions, trends appearing «to be», reactions omitting relativity in things, which are gradations in a continuity.
Truth or falsity, (un)stability, (dis)order, (un)balance are appearances excluding that all phenomena have scales, ranges, tones and gradient variations. Definitions are just failed intents to turn into something real what is between the real and the unreal, and Fort warns us about false consistencies on which we base our beliefs. Admitting relativity in knowledge is a way to deal with data in general, including that offered by mancias.