Research by Dan-Eric Nilsson's group at Lund, reported in 2026, reconstructs a worm-like ancestor around 600 million years ago bearing both lateral eyes and a central midline eye. In the sedentary filter-feeding phase of the vertebrate line, the side eyes were lost while the midline eye was retained, later elaborating into the paired vertebrate eye, with lancelets (amphioxus) preserving stages of the sequence. Nilsson's deeper point: the vertebrate retina is built from brain tissue, while insect and squid eyes form from head skin, two entirely separate construction projects.
The folk reading drafts the cyclops of myth, Homer's Polyphemus, Hesiod's one-eyed smiths, as garbled memory of a one-eyed ancestor. The cooler explanation is older and documented: elephant skulls, with their huge central nasal opening, read as giant single eye sockets to anyone who has never seen an elephant, a theory traced to Othenio Abel (1914) and popularized by Adrienne Mayor.
The claim: the parietal eye still carried by lampreys, many lizards, and the tuatara, complete with lens and retina, is the literal remnant of the cyclops organ, once primary, now vestigial, and the pineal's esoteric career as third eye is anatomy remembering itself. The soul-trap literature adds the inversion: the side eyes open, the midline eye sealed.
Did the vertebrate eye begin as a cyclops eye, and is the pineal gland its last witness?