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The Primality Lens is a single sided lens that can be attached to the ear, similarly like glasses. It is used to see if a number is composite or prime based off a color.
The Primality Lens is one of the three components needed for making the Triad Spectacle.
It is a normal half glasses that can be placed on the face, oddly not being able to fall off.
Through the lens, if a Number entity is viewed, they will either glow blue or red. Red indicating it is prime, like 3, and blue indicating it is composite, like 4.