Cats eye

 A "cat's eye" typically refers to two things: the unique, gemstone-like quality of a cat's eye and the actual cat's eye gemstone. 

1. **In Cats:** The term describes the distinct, slit-shaped pupils of a cat, which adapt to light levels, widening in darkness to help with night vision and narrowing in bright light. This feature gives cats an intense, mysterious look that has fascinated humans for centuries.

2. **In Gemstones:** The "cat's eye" effect, or *chatoyancy*, appears in certain stones like chrysoberyl, quartz, or tiger’s eye. This effect creates a line or band of light that moves across the surface of the stone, resembling a cat's eye. Cat's eye stones are often associated with protection and good fortune in various cultures.

Do you have an interest in capturing this effect on video, or are you curious about the stone’s symbolism and uses?