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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“Men of extraordinary success, in their honest moments, have always sung, “Not unto us, not unto us.” According to the faith of their times, they have built altars to Fortune, or to Destiny, or to St. Julian. Their success lay in their parallelism to the course of thought, which found in them an unobstructed channel; and the wonders of which they were the visible conductors seemed to their eye their deed.”
—Ralph Waldo Emerson (1803–1882)