The Curious Case of Tetrachromats
Last Sunday, while wandering through the flower stalls near Malleswaram railway station—where marigolds tangle with roses in a riot of scent and color—I paused at a basket of pink bougainvillea. They weren’t the usual magenta or purple-pink you see dotting Bangalore walls. No, this was… different. A sort of coral-meets-crimson-meets-sunset shade that shimmered ever so slightly under the filtered sunlight. I turned to the vendor, curious, and said, “Is this a different kind of bougainvillea?” She shrugged and replied, “All look same only, madam.”
And that’s when it hit me: do we really all see the same colors?
Turns out, we don’t. In fact, some people might be seeing more colors than the rest of us—colors that don’t even exist in our vocabulary. They’re called tetrachromats.
Let’s go on a little sensory journey together, shall we?
What Even Is a Color?
Before we dive into tetrachromacy, let’s rewind a bit. Color, as we know it, is not actually in the object. It’s not something the flower owns like a petal or a thorn. Color is how our brain interprets light of different wavelengths.
Our eyes have special cells called cones, each tuned to a range of wavelengths. Most of us have three types:
- S-cones for short wavelengths (blues)
- M-cones for medium wavelengths (greens)
- L-cones for long wavelengths (reds)
This is called trichromatic vision, and it gives us access to around a million different color combinations. A million! That’s more than the number of WhatsApp forwards my aunt sends during festival season.
But here’s the twist: not everyone is limited to just three cones.
Enter the Tetrachromats: The Color Super-Viewers
Some people—mostly women, interestingly—have four functioning types of cones. This condition is called tetrachromacy.
Think of it like adding a new string to your guitar. Suddenly, you can play harmonies you couldn’t before. In color terms, it means perceiving subtle shades between shades—colors that look identical to us might appear entirely distinct to a tetrachromat.
Imagine looking at a rainbow, and instead of seven colors, you see hundreds. Not in a psychedelic, cartoonish way, but in subtle gradations—like the difference between rose pink and cherry blossom pink and sunrise mist pink. If those aren’t familiar to you, that’s kind of the point.
Why Mostly Women?
This gets a bit technical, but stay with me—there’s science gossip involved!
The genes for red and green cone cells are located on the X chromosome. Since women have two X chromosomes, they have the potential to carry two different versions of the gene for the red or green cone, potentially giving them a bonus cone type.
Most of the time, that extra cone type doesn’t kick in functionally. But in rare cases—about 3–5% of women, according to some estimates—it does. These women might unknowingly walk around with a whole new dimension of color perception.
It’s like being handed a magic lens without realizing everyone else is color-blind to it.
How Do You Know If You’re a Tetrachromat?
Good question! It’s actually not easy to tell.
Because the world hasn’t been designed with tetrachromats in mind, there’s no standard test you can take at the optician’s next to the chaat stall. Many tetrachromats don’t even know they have this superpower. They might just think everyone sees what they see.
In fact, one of the most famous studies on tetrachromacy involved a woman known only as “cDa29”—a pseudonym for privacy—who could distinguish far more shades than anyone else in the lab. Her vision was so refined, she could spot differences in hues that looked identical to researchers.
Imagine someone pointing at your favorite blue kurta and saying, “Oh no, that’s more of a midnight lapis.” And being right.
The Bangalore Test (Sort Of)
This got me wondering: what if someone like Mr. Murthy at the filter coffee stall near Shivajinagar is secretly a tetrachromat? The way he notices if the decoction has even a slight extra roast—could that extend to color too?
Maybe someone who works with rangoli powders, or silk dyes in Chickpet, or spices in Gandhi Bazaar—people who live and breathe color every day—are unknowingly tuned into shades the rest of us can’t even describe.
It’s a beautiful thought, isn’t it? That everyday life could be filled with hidden symphonies of color, right under our noses.
But Wait, Do They Really See More?
Here’s where it gets tricky. Just because someone has four cones doesn’t guarantee they use all of them effectively. The brain needs to know what to do with that information.
It’s a bit like giving someone a fourth drumstick at a music jam—sure, they have more range, but if their brain doesn’t integrate it, it’s just more noise.
Some researchers believe that true tetrachromats not only have the fourth cone but also a neural system capable of interpreting the subtle variations. In other words, it’s not just the eye—it’s the brain that finishes the painting.
Is It an Evolutionary Advantage?
Possibly. But not dramatically so—at least not in the modern world of LED screens and standardized Pantone palettes.
Back in our evolutionary past, being able to detect subtle variations in fruit ripeness or spot camouflaged predators might’ve been a big deal. Today, it might help you pick better lipstick shades or win more Holi powder matching contests.
Still, it makes you wonder—what other senses might some people be experiencing more vividly than others?
Seeing Through Someone Else’s Eyes
Sometimes I think about how much of our reality is shaped by how we see. Literally. If your palette of perception is different, does that shift your understanding of beauty, mood, even memory?
For example, I remember standing in Cubbon Park during golden hour—the light turning the canopy into a warm, leafy cathedral. I felt something shift in my chest, a little tug of joy mixed with awe. And I wondered… would a tetrachromat feel that even more deeply?
Would they see extra notes in the light? More nuance in the shadows?
Or would it just be… different?
Final Thought: What Colors Are We Missing?
You think humans are the best at seeing color? Let me introduce you to the mantis shrimp—possibly the most overqualified visual champion in the animal kingdom.
This technicolor marvel has up to 16 different photoreceptors—compared to our humble three. Some detect ultraviolet light, others polarized light. It’s like they’ve got a kaleidoscope hardwired into their brains. Now, scientists still debate whether they actually use all of those channels, but one thing’s clear: the mantis shrimp is experiencing a reality drenched in colors we can’t even name.
Basically, if Earth ever hosted a “Who Sees It Best?” competition, the mantis shrimp would win gold… and probably punch the trophy with its hyperspeed claw just for fun.
So maybe, just maybe, there are entire symphonies of color playing around us—some seen, some not. And maybe that bougainvillea near Malleswaram wasn’t just pink. Maybe it was singing.
To someone else, maybe it still is.
And that, to me, is what makes the world so wonderfully full of wonder.
So the next time you marvel at a sunset or argue with someone over whether a dress is blue or gold—pause for a moment.
Ask yourself: What if we’re all looking at the same sky, but seeing completely different poems?
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