When a magnet is held near the polish, it creates a captivating 3D effect, often resembling the slit pupil of a cat's eye or a streak of light on a polished gem." As for why they're popular this ...
In dim conditions, the pupil fully dilates into a round shape ... even if they were visually similar. The cat's eye camera beat the conventional camera five out of seven times, and the two times ...
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