Using an experimental technique called "Oz," researchers stimulated the human retina such that people saw a brand-new color.

Researchers behind a recent study claim to have discovered a new color that the natural, naked eye cannot perceive — 'olo,' a hyper-saturated blue-green that occurs when a single kind of cone cell is stimulated in the retina.

Researchers have hacked the human eye and discovered a previously unseen color called 'olo,' which only five people on Earth have ever seen.