If perceptual content is holistically constrained by background theory, as Quine's underdetermination thesis implies, then no single perceptual belief is immune to revision given sufficient theoretical pressure.
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Quine's underdetermination thesis(the main philosophical principle being discussed)
The philosopher Willard Van Orman Quine's idea that the evidence we gather from experience can never uniquely determine which scientific theory is correct—multiple different theories could fit the same observations.
Theoretical pressure(explaining why we might need to revise our beliefs)
When a new scientific theory or body of knowledge challenges or conflicts with what you currently believe, creating a reason to change your mind.
background theory(meta-theoretic foundations)
The foundational theory one must employ in order to articulate or formalize a broader philosophical conception such as the multiverse view
perceptual belief(Sellars's two-element view of perception)
A belief or belief-like state about what is perceived, which in some cases does not accept appearances at face value.