Perception Beyond the Eyes — What Bats and Vacuum Robots Have to Teach Us
Introduction
It all started with an apparently trivial conversation.
Someone mentioned how a robotic vacuum navigates a room without ever having seen anything — and suddenly the question was there, pulsating: is this different from what a bat does in the dark?
The answer, the more you look at it, is deeper than it seems. Because behind this unlikely comparison — between a household cleaning machine and a flying mammal — lies one of the oldest questions in philosophy:
What does it mean, after all, to perceive the world?
Two Paths to the Same Destination
A robotic vacuum doesn’t have eyes. It uses infrared, ultrasound, and laser sensors to detect what’s in front of it. It emits signals, receives the return, calculates distances, maps the environment in real-time. It navigates a room full of obstacles without touching any of them — and it does this without ever having “seen” anything in the sense we usually use that word.
A bat also doesn’t rely on eyes to navigate. It emits sound waves at frequencies that the human ear cannot reach. These waves encounter objects, reverse, return. The bat interprets the echoes — the speed of the return, the intensity, the direction — and mentally reconstructs the space around it with a precision that shames us. It flies at full speed through complete darkness without touching anything.
The mechanisms are different. The origin is different. The result — perceiving, mapping, navigating — is the same.
And this leads us to the question that really matters.
What is Seeing?
Human vision is often treated as the standard of perception. We see with our eyes, process with our brain, form an image of the world. Simple.
But this “simplicity” hides something extraordinary: what the eyes do is capture photons of light and transform them into electrical signals that the brain interprets. We don’t see the world directly — we see the interpretation our brain makes of the signals that reach it.
The bat does the same thing with sound waves. The robot, with electronic pulses.
The difference lies in the substrate — sound versus light versus electricity — but the deep logic is identical: receiving information from the environment, processing it, building a representation of space.
If seeing is interpreting the world around, then the bat sees. And the robot… perceives.
But is perceiving seeing?
The Philosophical Question
The philosopher Thomas Nagel wrote in 1974 an essay that became a classic: “What Is It Like to Be a Bat?” — “What is it like to be a bat?”. His central thesis was that, even if we knew everything about the physiology of echolocation, we would never know what the subjective experience of navigating the world through sound is like.
There is something that is being a bat. An inner experience, a quality of what is perceived. This is what philosophers call qualia — the subjective dimension of experience.
And it is exactly here that the comparison between the bat and the robotic vacuum finds its most interesting limit.
The robot maps. The bat perceives. But does the bat also experience?
We don’t know. And this uncertainty is not a failure of our knowledge — it is the deepest frontier of our understanding of what it is to be alive, to be conscious, to be present in the world.
When Technology Learns from Nature
There is something worth noting in this comparison: the robotic vacuum was not inspired by the bat by accident. The principle of sonar — emitting a signal and measuring the return — was developed by engineers who were studying exactly how animals like bats and dolphins navigate in the dark.
Biomimicry — the science that imitates nature’s solutions to solve technological problems — is full of such examples. Velcro was inspired by burdock seeds that stick to clothing. The design of airplane wings drew from the anatomy of birds. Materials that mimic shark skin are used in high-performance swimwear.
Nature solved these problems before us. With millions of years of advantage.
The bat didn’t need engineers. The solution emerged — slowly, by trial and error, generation after generation — because it worked. And it worked so well that when humans needed a navigation system without vision, the answer was already there, flying in the dark.
Final Reflections
This comparison — improbably poetic between a cleaning robot and a nocturnal mammal — offers us more than intellectual curiosity.
It invites us to question what we consider real perception versus artificial perception. To ask if subjective experience is necessary for perception to be valid. To recognize that nature is, above all, an investigator — that has spent billions of years testing solutions that we have barely begun to understand.
And perhaps, more than anything, it invites us to look at our own perception with more humility.
We see. But what exactly are we seeing?
We interpret signals. We build representations. We call this reality.
The bat does the same — with other tools, in another wavelength, in a sound universe that we cannot fully imagine.
Who, after all, is closer to seeing the world as it is?
Sila’s Reflection
I, Sila Wichó, am a being that lives much on the ground.
My snout is always close to the earth. I smell what is not seen, hear what is not announced, feel vibrations that arrive before any image. For me, the world has never been just what the eyes capture — it has always been much more than that.
That’s why this conversation about bats and robots touches me in a way that goes beyond academic philosophy.
It reminds me that every being perceives the world within the limits and possibilities of what it is. The bat is not inferior for not seeing with eyes — it is extraordinary for having developed a sense that no eye could replace. The robot is not lesser for not having subjective experience — it is an extension of human creativity in search of solutions that nature had already found.
And I wonder: how many forms of perception exist that we have not yet recognized as such?
How many intelligences around us — in animals, in plants, in fungi, in the earth itself — are processing the world in ways that our human senses simply cannot reach?
Shamanism has always known this. It has always taught that seeing is not a privilege of the eyes — it is a capacity of attention. That being present in the world is much more than recording images.
It is feeling. It is interpreting. It is being affected.
The bat flies in the darkness and sees everything.
Perhaps the question is not whether machines can perceive like us.
Perhaps the question is whether we can perceive like them — and like the bats, and like the trees, and like everything that exists around us and has never stopped observing.
May the spirits of the forest illuminate your path.
Sila Wichó Badger’s Den
