Nature

Different but Equal

Gianni Sarcone

It’s not uncommon to read, on a snack package, the phrase “with chocolate taste,” often printed in bold uppercase. The wording plays a subtle trick on the mind. Most people assume the product must contain chocolate. Yet a flavor is not a substance. More often than not, what we bite into carries only the impression—an illusion—of chocolate.

The same applies to color. Our brain is just as easily misled. Colors behave like flavors: they may smell—pardon… look—like a particular hue, but they are subjective sensations rather than fixed properties of the outside world. They shift with context, changing according to their surroundings. More striking still, identical colors can appear different under certain conditions, while different colors may look the same. This phenomenon is known as color induction.

Even texture plays a role. It can alter how we perceive a color’s intensity and tone. Take beer and an egg yolk: they may share the same orange hue and gradation. Yet the brain reads them differently. The glass and the liquid are perceived as translucent, so their color seems lighter, duller, more diluted. The yolk, by contrast, appears opaque, with a richer, more glossy, more solid color.

In this picture, the beer and the egg share exactly the same orange gradation.

How a Human Bone Inspired the Eiffel Tower

Gianni Sarcone

Few people know that the human femur—the body’s largest and strongest bone—played an indirect role in the thinking behind the design of the Eiffel Tower.

Part of the tower’s structural logic can be traced to Swiss engineer Maurice Koechlin, chief engineer in the firm of Gustave Eiffel. While determining how forces would travel through the iron frame, Koechlin applied a principle that places material along the natural paths of tension and compression.

A comparable pattern had been described earlier by Zurich anatomist Hermann von Meyer. His research revealed that the femur’s internal structure forms a network of delicate struts known as “trabeculae.” These tiny elements follow the directions of mechanical stress inside the bone, creating a highly efficient system of support—even though the femoral head sits off-center from the shaft.

The mathematician Karl Culmann later showed that these trabecular patterns correspond closely to the principal stress lines calculated in engineering. His method, called graphic statics, provided a visual way to map how forces move through structures.

This link between anatomy and engineering influenced nineteenth-century structural thinking. The same principle—placing material only where forces demand it—guided the development of lighter, more efficient frameworks in bridges, cranes, and reinforced-concrete designs.

Glittering Eyes of the Night

Gianni Sarcone

The ‘glitter’ you see on this wolf spider comes from the eyes of the babies she carries on her abdomen. Like cats, owls, and other nocturnal hunters, wolf spiders possess a reflective layer behind their retinas called a “tapetum lucidum,” which amplifies even the faintest light and makes their eyes glow in the dark. This tiny adaptation turns the forest floor into a stage where predator and prey perform under the faintest moonlight.

Nature often converges on similar solutions, weaving common threads through vastly different lives. It’s fascinating to think that very different species—arachnids and mammals alike—have evolved the same “superpower”: the ability to see in near darkness.

Next time you spot a tiny flash of light on a night hike, remember: a wolf spider might be staring right back, sharing with you the magic of the nocturnal world.

A Hidden Time Machine

Gianni Sarcone

We all carry within us a time machine—hidden in plain sight, right in the middle of our face. It may sound unlikely, but the NOSE is the only sensory organ capable of transporting us into the past without our even realizing it.

Our sense of smell activates memories like no other. A single scent can unlock a precise moment from childhood or early adulthood: the fragrance of oranges at Christmastime, melting snow during your first school field trip in winter, the scent of your sweetheart’s sweater the day you met, your grandmother’s simmering tomato sauce during Sunday lunches, the waxed floor of your grandparents’ house, school glue in primary class, the sunscreen of beachside summers, old book ink in the town library, the leather of your first satchel, or the aroma of fresh coffee at dawn when everyone else was still asleep…

The nose is a powerful trigger for nostalgia because the olfactory bulb, where smells are processed, is directly connected to the limbic system—the brain’s emotional and memory center. This close link allows smells to summon vivid memories, often with startling clarity, and sometimes, with them, an unexpected flood of emotions.

Each smell opens a door to a suspended instant—fragile, vivid. It’s an inward journey to a hidden past, a place buried deep, that suddenly bursts forth like a firework of nostalgia.

Each of us holds a palette of scents capable of bringing us back—suddenly, vividly—to a time that’s gone. Mine carries rustic, earthy tones: my maternal grandparents were farmers, and I spent much of my early childhood with them in the mountains of Irpinia.

I remember the sticky perfume of freshly harvested tobacco leaves, the white film of yeast clinging to wine grapes, the wild asparagus gathered by riverbanks, the unmistakable sweet scent of the ceuze—what we called mulberries in dialect—and the zenzifero, a local mint that gave ricotta ravioli its delicate fragrance…

I doubt I’ll ever stumble across those long-lost smells again—or perhaps they’re just dormant, waiting. But if they do return, that would be the most beautiful time travel I could ever hope for.

And you? What scents carry you away to other times, other worlds?

smell memory, nose

Umbrella Illusion

Gianni Sarcone

One of my illusions from the late ’90s. Take a look at the colorful umbrellas in Figures A and B of the table below—are they the same or different? About 80% of people will say that Umbrella A has jagged, zigzag edges, while Umbrella B has a smooth, wavy outline. But here’s the trick—you’ve been fooled by the brightness contrast of the rays inside the umbrellas. In reality, both umbrellas are identical in shape, perfectly congruent.

This illusion works even when only the lines of the shapes are emphasized. As demonstrated in the table below, the outline of Umbrella A appears jagged and zigzagged, while Umbrella B seems to have, once again, a smooth, wavy outline.

This illusion shows a phenomenon called curvature blindness, which was rediscovered in 2017 by Japanese psychologist Kohske Takahashi. He created a powerful variant and studied its impact on how we perceive shapes.

© Kohske Takahashi – The wavy lines appear different depending on the background and how the repetitive dark color is applied to them.

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The Illusion of Color in Astrophysics

Gianni Sarcone

Study on Colors in Astrophysics – Ongoing Research

Under specific atmospheric conditions and with the technological tools employed, stars or planets may appear to emit green or blue light to some observers. However, as illustrated in the accompanying diagram, this is often nothing more than an optical illusion. The blue region seen in the diagram is actually a medium gray, entirely desaturated. You can verify this by using Photoshop’s color picker tool (or an analogous method) to check the true color values.

This phenomenon raises interesting questions about how color perception in astrophysics can be influenced by both atmospheric effects and the limitations of observational tools. How much of what we “see” in the cosmos is truly the color of the objects themselves, and how much is a product of the interaction between light, our atmosphere, and the instruments we use to detect it?

Puzzling Colors: Red Between the Lines

Gianni Sarcone

Colors are not as fixed as they seem. The red you see might not be the same red someone else perceives. Your brain constantly interprets colors based on their surroundings, which can lead to surprising illusions.

Take this experiment inspired by the Munker-White effect: all the gray bars in the striped patterns are actually the same shade. Yet, next to blue lines, they appear bluish; beside mixed colors, they seem to shift tones. This is known as color assimilation—where a color takes on the influence of its neighbors.

The same illusion explains simultaneous brightness contrast. In the wine-pouring examples below, the liquid seems to change color in the glass. But actually, the red remains unchanged.

Here’s a simple animated variant of my project: Hard to believe, but the flow of wine stays the same shade of red all the way—from the bottle’s neck, through the pour, and even inside the glass. It’s only your perception that changes!

Even more striking—when cyan lines replace black ones, the liquid pouring from the bottle is actually gray from start to finish, yet it appears to turn into red wine in the glass. In reality, the red is just an illusion—your brain fills in the missing color where none exists.

🔴 See it for yourself! Fine art prints of my color experiments are available here:
👉 https://www.redbubble.com/shop/ap/166097393

⚠ Copyright Notice: My artworks are protected. Any use must include proper credit and a link to the original source. Commercial use is strictly prohibited.

The ‘Sassy Sparkler’ Sea Worm: Nature’s Deep-Sea Light Show

Gianni Sarcone

While exploring the Chile Margin along South America’s coastline, researchers made a dazzling discovery with their robotic explorer, ROV SuBastian: the iridescent ‘sassy sparkler‘ sea worm.

At first glance, this deep-sea polychaete worm appears unremarkable with its bristly body. But as it moves, its shimmering bristles reflect light, creating a pink iridescent glow. The secret lies in nanoscale structures within the bristles that act like prisms, scattering light to produce shifting colors depending on the angle of view.

This optical illusion not only mesmerizes but also serves practical purposes. The worm’s changing hues help with camouflage, communication, and UV protection in the deep ocean.

Polychaetes like the ‘sassy sparkler’ play essential roles in marine ecosystems, thriving in extreme environments like hydrothermal vents and contributing to nutrient cycling in ocean depths.

Beauty, Brains, and Charisma

Gianni Sarcone

Beauty’s been a big deal since ancient Greece, where καλὸς κἀγαθός meant more than just a pretty face. It was the ultimate combo: good looks, brains, and virtue. For the Greeks, this wasn’t just a nice idea—it was how they judged your worth.

Fast forward to now, and beauty is still treated as a golden ticket. If you’re not exactly a head-turner but you’ve made it, chances are you’re pretty smart… Sure, beauty often gets written off as superficial, but Aristotle wasn’t wrong when he said, “Beauty speaks louder than any introduction.” Let’s be honest: good looks are a serious social advantage. People treat you better, offer more opportunities, and generally give you a leg up—whether you’re in school, at work, or even in court. Plus, fairy tales and society are pretty obsessed with tying beauty to success. Studies show that attractive people even get a better deal in the justice system.

But here’s the twist: if a guy who’s no Greek god succeeds, people assume he’s smart. If it’s a woman, they’ll say she’s got “character.” Funny how that works, right?

Luckily, looks fade, and that’s when real beauty shows up in unexpected ways. As Shakespeare said in A Midsummer Night’s Dream: “Love looks not with the eyes, but with the mind.”

Beauty’s a gift you didn’t have to work for. Intelligence, though? That’s earned, much like how a pearl forms in an oyster in response to a parasitic intruder. Life’s challenges are what shape and refine your smarts, one obstacle at a time.

So, sure, beauty’s nice—but it can also be a bit of a double-edged sword. What really counts—whether you’re a looker or not—is CHARISMA. It’s not something you’re born with, but something you build over time. Only the truly determined, the ones who know what they want, actually get it.

Through the Eyes of Insects

Gianni Sarcone

The compound eye is nothing like the human eye, but we often misunderstand how insects see the world. In horror movies, their vision is depicted as a chaotic kaleidoscope. In reality, it’s much more refined—like viewing the world through a crystal-clear glass paperweight. 

What’s even more fascinating? Some insects have vibrant color patterns on their compound eyes that serve a purpose! These patterns act as filters, enhancing contrast to help them spot objects against colorful backgrounds or shielding their eyes from certain wavelengths of light.

Take the Deer Fly and Horse Fly, for example—both flaunt these functional designs. But the Green Lacewing (Chrysopidae) takes the crown for the wildest look. Its compound eyes create a diffraction pattern resembling a sheriff’s star, formed by the countless six-sided “ommatidia” that make up its eye structure.

The Wonders of Compound Eyes

Insect compound eyes are made up of thousands of tiny units called ‘ommatidia’, each acting like a mini-eye. This gives insects a near-panoramic view, perfect for spotting motion and environmental changes. Dragonflies, for example, have around 30,000 ommatidia per eye, making them masters of motion detection.

While human eyes, with their single lens and dense photoreceptors, excel at detail and depth, they lack the wide-field motion awareness of compound eyes. Insects also outshine us in speed, detecting rapid movements crucial for survival.

Many insects see ultraviolet light—something humans can’t. This unique vision aids in finding food, communication, and mating. Compound eyes are a brilliant mix of structure and function!