The color "olo" is described as a deeply saturated blue-green or teal hue that is unlike any color naturally visible to the human eye. It is an intensely vibrant and profoundly saturated teal, more vivid than any blue-green color encountered in the natural world

. "Olo" cannot be seen without technological assistance. Researchers used a device called Oz, which directs laser pulses precisely into the retina to stimulate only the medium-wavelength (M) cone cells, bypassing the usual overlap with other cone types. This selective stimulation creates a perceptual experience of a color outside the normal human visual spectrum

. Only five people have ever seen olo, and they described it as a unique blue- green shade that is more saturated and vivid than any natural color, making even the most vibrant natural colors seem dull by comparison

. In summary, olo is a new, highly saturated blue-green or teal color, visible only through specialized laser stimulation of the retina, and it represents a color experience beyond the boundaries of normal human vision.