Blurs

Distinction by Opacity: When Differences Are Defined by What We Cannot See 'Distinction by opacity' captures a powerful and recurring idea across epistemology, cognitive science, linguistics, and theory of knowledge.  At its core, it describes a situation where two things are treated as distinct not because their differences are fully understood, but because those differences are partially or entirely inaccessible to us. In other words, the distinction is maintained not by clarity, but by limitation. What “Opacity” Means in This Context In everyday language, opacity refers to something that is not transparent—you cannot see through it. In philosophical usage, it extends beyond physical visibility to include cognitive and explanatory opacity: • We cannot fully observe the underlying structure • We cannot reduce one phenomenon to another in a clear way • We cannot translate between two descriptions without loss or ambiguity So when a distinction is made “by opacity,” it means: • ...