Eye

From Spanking Art
Human eye, closed.

Eyes are organs that detect light. The simplest "eyes", in even unicellular organisms, do nothing but detect whether the surroundings are light or dark, which is sufficient for the entrainment of circadian rhythms and may allow the organism to seek out or avoid light. More complex optical systems with resolving power have come in ten fundamentally different "designs", and 96% of animal species possess a complex optical system.

When a person is crying, tears come out of their eyes.

See also[edit]

Human eye, open.
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