How did Friedrich Nietzsche’s perspectivism challenge the idea of completely objective knowledge?

Friedrich Nietzsche’s perspectivism challenges the possibility of completely objective knowledge by asserting that all knowledge is inherently situated, partial, and mediated. He argued that there is no such thing as an "immaculate perception" or a "view from nowhere," as the concept of knowledge independent of a vantage point is as incoherent as attempting to see an object from no particular perspective at all.12

Nietzsche further contended that:

• Mediated Access: Human conceptual access to the "in-itself" of objects is always filtered through the rhetorical and representational contingencies of language, meaning our understanding is never direct or pristine.1
• Biological Function: The intellect is not a neutral tool for discovering objective truth but a practical instrument developed by the human species for self-preservation and mastery over a hostile environment.1
• Rejection of Totality: Perspectivism denies the existence of an all-inclusive perspective that could synthesize all viewpoints to reveal reality as it is in itself.2

Ultimately, Nietzsche viewed "truths" as a series of metaphors and human relations that have been forgotten as illusions, serving specific needs rather than reflecting an objective reality.1