A parietal eye, also known as a third eye or pineal eye, is a part of the epithalamus present in some animal species. The eye is photoreceptive and is associated with the pineal gland, regulating circadian rhythmicity and hormone production for thermoregulation.
Read more about Parietal Eye: Function, Anatomy, Comparative Anatomy, Analogs in Other Species, See Also
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“A good leg will fall, a straight back will stoop, a black beard will turn white, a fair face will wither, a full eye will wax hollow, but a good heart, Kate, is the sun and the moon—or rather the sun and not the moon, for it shines bright and never changes, but keeps his course truly.”
—William Shakespeare (1564–1616)