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In an April 2025 experiment, researchers used a laboratory system called Oz to map the retina and selectively stimulate M-cones with laser microdoses. Five participants reported an unusually saturated blue-green percept they named olo. It is not a new wavelength, pigment, or color that a screen or paint can reproduce.
Color begins when light reaches the retina at the back of the eye. Most people with typical trichromatic vision have three broad classes of cone photoreceptors:
| Cone | Most sensitive to | Important qualification |
|---|---|---|
| S cones | Shorter wavelengths, associated with blue | They respond across a range of wavelengths rather than to one pure blue. |
| M cones | Middle wavelengths, associated with green | Their responses overlap substantially with those of L cones. |
| L cones | Longer wavelengths, associated with red | They also respond to much of the green portion of the spectrum. |
These cones are not three isolated color switches. Their sensitivity curves overlap. In particular, natural light cannot selectively activate M-cones in the manner used by Oz while avoiding the usual accompanying activation pattern.
Imagine the visual system receiving a green light. M-cones respond, but L-cones respond too. The brain interprets the balance between those signals as a particular green. Oz attempts to interrupt that usual relationship by selectively stimulating M-cones.
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The result is not simply brighter green. It is a different pattern of information arriving from the retina—one that ordinary illumination does not provide.
Why a normal green light cannot produce olo
A painter can mix pigments until a green appears extraordinarily pure. A display can emit a highly saturated green. Both still send ordinary light into the eye, producing overlapping responses in several cone classes.
As UC Berkeley optometry and vision science professor Austin Roorda put it, “There’s no wavelength in the world that can stimulate only the M cone.” That is why simply finding a more intense green does not solve the problem. Intensity changes the strength of the signal; it does not create the selective cone stimulation used by Oz.
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How the Oz retinal microdisplay works
Oz is a laboratory platform that maps cones and directs laser microdoses toward selected photoreceptors while accounting for eye motion. It is not a conventional projector, and the laser itself is not “olo-colored.”
- Researchers map the participant’s retina. Imaging identifies cone locations so the system can target selected cones.
- The system accounts for eye motion. Oz tracks the eye to help keep the stimulus aligned with the intended retinal locations.
- A green laser delivers microdoses. The platform directs light toward selected cones in a mapped retinal area.
- The pattern can be controlled at scale. UC Berkeley’s Helen Wills Neuroscience Institute reports that Oz can stimulate up to 1,000 specific cone photoreceptors at one time.
In a control described by UC Berkeley, researchers jittered the laser so it missed its intended cones; participants then perceived the ordinary green of the laser. This supports the role of targeting in the reported effect.
That is the central technical achievement: not discovering a special light source, but controlling which photoreceptors receive light.
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What did olo look like?
Participants described olo as blue-green or peacock green and as more saturated than the nearest monochromatic green. Those labels communicate the general direction of the experience, but they are subjective reports, not a visual sample that others can inspect.
The reported experiment involved five subjects, according to the peer-reviewed study in Science Advances. The stimulated patch appeared about the size of a fingernail held at arm’s length, according to UC Berkeley’s College of Computing, Data Science, and Society. This was not a demonstration of people seeing every object around them in olo.
Why your screen, camera, and paint cannot show it
A screen image of olo is still an ordinary screen image. Red, green, and blue display light can create a vivid teal-like color, but it cannot reproduce Oz’s selective retinal stimulation.
The same limitation applies to photography, printing, paint, and online color swatches. A swatch can approximate the ordinary color participants used to describe olo, but it cannot transmit the percept itself.
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Paint marketed with names such as “olo,” “peacock green,” or “ultra-saturated teal” should be treated as a visual or commercial approximation, not a reproduction of the experiment. Even fluorescent paint cannot recreate Oz’s selective cone stimulation.
What painters can learn from the olo experiment
Olo cannot be mixed in a palette, but the experiment reinforces several ideas that matter in painting.
Color is an event in the eye and brain
A painted surface has physical properties—pigments absorb some wavelengths and reflect others—but the experienced color is constructed by the viewer’s visual system. Illumination, surrounding colors, adaptation, and viewing conditions all affect that experience.
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That is why a painting can make an ordinary pigment appear more luminous or saturated than it would in isolation. A carefully chosen surrounding color can change the visual signals and the brain’s interpretation of a focal color. Contrast can make a color appear more intense; it cannot create the selective M-cone stimulation produced by Oz.
“Saturated” does not mean “unlimited”
Artists can approach the limits of ordinary color experience using clean pigments, controlled lighting, high-contrast composition, and surfaces that preserve the intended reflectance. Fluorescent and highly chromatic materials may produce striking effects. Yet a surface still works by sending light through the eye’s existing pathways.
Olo demonstrates that the boundary of what people can experience is not identical to the boundary of what a conventional paint mixture can reflect. It does not mean a new paint color follows from the experiment: changing paint changes the incoming light, not the selective targeting of the retina.
Is olo really a new color?
The answer depends on what “new” means.
Physically, no: olo is not a new wavelength, frequency band, or extension of the electromagnetic spectrum. Oz uses existing visible light, including a green laser.
As a reported percept, yes: participants described a distinct experience produced by an unusual experimental stimulus. Researchers call the idealized percept from pure M-cone activation “olo.” This does not mean everyone experiences or describes it identically.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteThose statements are not contradictory. A color is not only a property of a light source; it is also a perceptual result. Scientists did not discover a hidden teal ray waiting in space—they found a way to deliver an unusual input to the visual system.
What the experiment may make possible
The most important result may not be the production of a spectacular teal. Oz gives vision researchers a way to ask controlled questions about the retina and brain by specifying which photoreceptors receive stimulation.
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Berkeley researchers discuss possible uses in studying cone loss, vision processing, color blindness, and tetrachromatic perception. These are research directions, not established treatments.
- Testing color perception: Researchers can investigate how the brain combines signals from different cone classes.
- Modeling cone loss: Selectively omitting or altering stimulation may help researchers study some effects of cone loss.
- Studying color-vision deficiency: The system may help researchers examine how altered cone signals affect perception.
- Exploring sensory expansion: Researchers can ask whether people can learn to interpret signals that ordinary scenes do not normally provide.
Oz does not give someone a permanent fourth cone class, correct color blindness, or provide enhanced vision outside the laboratory. The cited sources do not establish clinical effectiveness or commercial access.
The experiment’s important limits
The headline is broad; the demonstration was narrow. Several limitations define what the study can support.
- Only five subjects took part in the reported olo experiment. That is a small study and does not establish that everyone would experience or describe olo in the same way.
- The display was very small. UC Berkeley reports a patch about the size of a fingernail held at arm’s length.
- The system required retinal mapping and eye-motion tracking. The setup was a controlled laboratory platform, not a consumer device.
- The experience is subjective. Participant reports can describe a distinguishable percept, but they cannot provide an objective image of what olo “really looks like” in another person’s consciousness.
A larger field or unrestricted viewing would require further technical advances; the experiment did not demonstrate naturalistic enhanced vision.
Do not try to recreate olo with a laser
Oz is a laboratory research platform, not a consumer experiment. A consumer laser cannot reproduce the retinal mapping and selective stimulation used in the study. Do not shine a laser pointer, laser projector, or other concentrated light source into your eyes; direct laser exposure can damage the retina.
What this discovery really changes
Scientists did not invent a paint color that was missing from artists’ palettes. They demonstrated that the visual system can be addressed in a more selective way than ordinary light allows.
That is a more limited claim than the headline, but it is also more interesting. Instead of asking only what colors exist in the outside world, researchers can investigate what perceptions emerge when the brain receives carefully designed signals from individual classes of photoreceptors.
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For painters, the lesson is a reminder that every pigment is only the beginning of a color experience. For vision science, the larger opportunity is a new way to study how those experiences are built. Olo is not waiting to be bottled or mixed. It is a laboratory-induced percept—and a glimpse of how much of seeing depends on the signals the brain receives.
FAQ
What is olo?
Olo is the name participants gave to a reported, unusually saturated blue-green percept induced by Oz’s selective retinal stimulation. It is not a new pigment or wavelength.
Can humans see a new color?
In this experiment, five subjects reported a percept produced by an unusual cone-stimulation pattern. The study does not establish that everyone experiences it the same way.
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Can I see olo on a screen?
No. A screen can show an ordinary teal-like color, but it cannot reproduce Oz’s selective stimulation of mapped M-cones.
Can paint or a color chart reproduce olo?
No. Paint and color charts can approximate an ordinary color resembling descriptions of olo, but they cannot reproduce the laboratory stimulus.
Could Oz lead to color-blindness treatment or permanent enhanced vision?
Those are possible research directions, not established treatments or demonstrated permanent enhancements.
The Bottom Line
Bottom line: Olo is not a new wavelength or paint pigment. It is a reported color percept induced by Oz, a laboratory system that maps the retina and selectively stimulates M-cones. Five subjects took part in the reported experiment, and no screen or paint can reproduce its selective retinal stimulation.
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