Fractals, Colors & Visions: Are the Psychedelic Visuals You See Real or Your Imagination?

When you see geometric patterns and colors you’ve never seen before during a psychedelic journey, something real is happening inside your brain. Here’s what it is — and what it isn’t.

This article is intended for individuals seeking to understand the convergence of ancient wisdom and modern science. It does not constitute medical advice. Work with these medicines should always be undertaken with qualified guidance, appropriate preparation, and deep respect for the traditions from which they come.

People come back from journeys trying to describe what it was like, and most of the time find that everyday language simply doesn’t do the experience justice. How do you describe being able to feel what’s in someone else’s heart? How do you describe being able to see the fabric of reality? Spirals that contain entire universes. Colors that weren’t colors but feelings. Geometric structures so precise and elaborate they seem somehow melded with your mind as they map the surfaces of your awareness.

Psychedelic visions hum the tone of ancient consciousness.

I’ve sat in entheogenic ceremonies for three decades, with hundreds of people, on multiple continents, in traditions that have worked with entheogens from time immemorial. When you experience psychedelic visuals that represent another realm that feels no less real than the one you’re aware of as you read these words, you have a lot of questions. A growing number of seekers are joining the club of ‘knowers’ — those who understand that there is an alternate reality somehow behind this one, always present, just slightly out of phase, until the medicine tunes it in.

That is the question this article is going to answer: are the fractals, colors, and visuals you experience during a psilocybin journey real, or just your imagination in overdrive? Not from the perspective of whether the visions had meaning — they did — but from the perspective of what was happening inside your brain when they appeared. Because understanding the neuroscience of psychedelic vision doesn’t diminish the experience. It deepens your respect for what these medicines are capable of.

Why Geometric Patterns and Fractals Appear

Let’s begin with the most universally reported visual phenomenon across psychedelic traditions, across cultures, and throughout recorded history: the geometric patterns.

Spirals. Grids. Mandalas. Lattices. Honeycomb structures. Fractals that recurse infinitely, one pattern containing another containing another, smaller and smaller, without end. These are not random. And they are not culturally learned. They appear in the cave paintings of our earliest ancestors. They appear in indigenous artwork from traditions that had no contact with each other. They appear in the visions of a first-time journeyer on a camping trip in Colorado and in the visions of a shaman in the Amazon.

The architecture of your visual cortex is itself geometric. The primary visual cortex — the area responsible for processing what you see — is organized in columns and modules that display what neuroscientists call shift-twist symmetry and lattice symmetry. Under normal circumstances, these structures process incoming visual data from your eyes. But under psilocybin, something different happens.

Psilocybin reduces blood flow to the thalamus — the brain’s sensory gatekeeper — which normally filters and suppresses the vast majority of incoming sensory information before it reaches your awareness. When that filtering function is relaxed, the visual cortex begins generating patterns from its own internal architecture, patterns that are then projected into your expanded awareness. The brain stops receiving data and begins transmitting its own structure into your perception.

“What you see as fractals are literally the geometry of your own neural organization, made visible. You are perceiving the fractal nature of your own consciousness.”

A 2020 study published in NeuroImage found that psilocybin and LSD measurably increase the fractal dimension of cortical brain activity — meaning the brain’s own electrical patterns become more fractal-like under these medicines. Indigenous traditions have always known this. The sacred geometric patterns in ceremonial art across cultures — the spirals, the nested diamonds, the radiating mandalas — are not decorative. They are maps. Records of what practitioners saw when they went inside.

How Colors Intensify and Bleed

Almost everyone who has worked with psilocybin reports the same thing about color: everything becomes more. More vivid. More saturated. More alive. A green that was just a green becomes a green that seems to contain the entire history of every living thing that ever grew. And then the colors begin to move. To breathe. To bleed at their edges into neighboring colors in ways that shouldn’t be possible.

Some people describe it as feeling colors — not just seeing them, but experiencing a kind of emotional or sensory quality to the color itself that has no equivalent in ordinary perception. You may also see colors that don’t have names in any language you speak.

Psilocybin binds to the 5-HT2A serotonin receptors densely concentrated throughout the visual cortex. This binding causes these regions to activate in a way that mirrors how they respond to actual light — even when your eyes are closed or the room is dark. A 2025 study in Molecular Brain found that psilocybin activates the same genes in the visual cortex that light exposure does, which means the brain is generating its own light, its own imagery, independent of any external input.

Simultaneously, the brain’s normal top-down modulation — its capacity to filter and dampen sensory experience based on prior expectations — is significantly weakened. Under ordinary consciousness, your brain is constantly editing your perception, suppressing what it has decided is irrelevant. Under psilocybin, that editing function quiets. What remains is raw, unfiltered sensory data flooding through a highly activated visual system.

The result is not distortion. It is, in a very precise neurological sense, more perception. The colors were always that complex. Your brain was simply choosing not to show you.

Eyes Open vs. Eyes Closed: Two Very Different Worlds

One of the most practically useful things to understand before a journey is the profound difference between what you experience with your eyes open versus your eyes closed.

Eyes Open

With eyes open, psilocybin doesn’t typically create things that aren’t there. Instead, it transforms what is there. Walls breathe. Objects shift subtly at their edges. Patterns emerge on flat surfaces — the grain of wood becomes a river, the texture of a carpet becomes a living meadow. Light bends and halos form around sources of illumination.

A 2024 study in Molecular Psychiatry on neural mechanisms of psychedelic visual imagery found that eyes-open visuals are driven primarily by enhanced bottom-up sensory processing — meaning the brain takes real external input and amplifies, enriches, and cross-references it with emotional and memory centers it would not normally consult. This is why set and setting matter so profoundly for what you see. The journey paints with whatever canvas you give it.

Eyes Closed

Close your eyes during a psilocybin experience and you enter a different world entirely. The external world disappears and what emerges is generated entirely from within. Closed-eye visuals tend to be more immersive, more symbolic, and more emotionally charged. They can range from simple patterns in the early stages to fully immersive landscapes, narrative sequences, and encounters with what many people describe as presences or beings at higher doses.

Research from Schizophrenia Bulletin (2025) confirms that these closed-eye visuals involve the same brain regions as dream imagery and imagination — which is why they often carry the quality of dreaming while fully conscious.

Many experienced facilitators recommend spending the peak of a journey with eyes closed — allowing the medicine to work through the deeper imagery that emerges in that internal space — and reserving eyes-open time for the gentler rising and coming-down phases, when the external world’s enhanced beauty can be a source of grounding and wonder. Your intuition will guide you.

Why Some People See Visions and Others Don’t

This is perhaps the question I am asked most often, and the one that carries the most emotional weight. Someone attends their first ceremony, and the person beside them reports profound visual imagery while they themselves see very little. Perhaps some color enhancement. Perhaps mild pattern overlays. But nothing close to what others describe.

And they wonder: is something wrong with me? Did I take enough? Did I do it right?

Let me address this directly. Psilocybin’s visual effects vary enormously between individuals, and the research is clear about why.

Dose. The relationship between dose and visual intensity is real. Lower doses tend to produce subtle perceptual shifts rather than dramatic visual phenomena. Higher doses move progressively through pattern overlays, color enhancement, open-eye visual transformation, and ultimately closed-eye immersive imagery.

Individual neuroanatomy. The density and distribution of 5-HT2A receptors in the visual cortex varies significantly between individuals. Some people simply have more receptor sites available for psilocin to bind to. This is not a measure of sensitivity, spiritual openness, or depth of experience. It is anatomy.

Set and setting. A high level of ambient anxiety, an uncomfortable environment, or strong resistance to surrendering control will redirect the brain’s resources away from visual processing and toward threat assessment. The journey is still happening — it is simply working through a different channel.

Eyes open vs. eyes closed. Many people who report few visuals have been sitting with their eyes open throughout the experience. Closing the eyes, especially during the peak, dramatically increases the likelihood and richness of visual phenomena for most people.

Experience and familiarity. The relationship between a person and the medicine deepens over time. Your visuals may become more accessible and meaningful as you develop a longer relationship with it — not because your brain changed, but because your capacity to surrender deepens.

If you have had an experience with limited visual content, I would invite you to ask not ‘why didn’t I see things’ — but ‘what did the medicine choose to work with instead?’ Some of the most profound healings I have witnessed in ceremony produced no dramatic visuals at all. The medicine knows what you need. Whether you trust that is up to you.

What It All Means — and What It Doesn’t

This is where I want to be careful. And honest.

The neuroscience of psychedelic vision is genuinely remarkable. Understanding that the fractals you saw were the geometry of your own neural architecture made visible — that is not a diminishment of the experience. That is an extraordinary fact about the nature of consciousness and matter.

But neuroscience does not explain everything. It does not explain why specific symbols appear that carry personal meaning the person had no way of anticipating. It does not explain the encounters that feel like meetings with something beyond the self. It does not explain why the same geometric forms appear independently in traditions that never had contact with each other — and why those forms are revered as sacred in every one of them.

The science tells us the mechanism. It does not tell us the meaning.

What I have come to understand after three decades: the visions are both. They are neurological events, generated by a brain that has temporarily expanded its processing capacity and relaxed its ordinary filters. And they are also something more — communications, symbols, encounters — that arrive through that expanded capacity and carry information the ordinary mind would not have accessed.

“The visual cortex is the instrument. But something else is playing it.”

A few things worth saying plainly. Psychedelic visuals are not evidence of psychosis — they are state-dependent, fully resolving as the medicine metabolizes, and categorically different from the visual disturbances of psychotic disorders. They are not hallucinations in the clinical sense, which involves a complete loss of reality-testing. Most people under psilocybin retain awareness that they are having a medicine experience, even while perceiving extraordinary imagery. And they are not the measure of a good journey. A quiet, internally focused experience with minimal visuals can produce as profound a transformation as one filled with elaborate imagery.

You weren’t hallucinating. You were seeing. Seeing the geometry of your own consciousness. Seeing the color of the world stripped of your brain’s habitual editing. Seeing, perhaps, something that the ordinary mind is not built to perceive.

The visual cortex is one of the most ancient and sophisticated systems in the human body. It evolved over millions of years to process and interpret the world. When the medicine arrives, it doesn’t break that system. It expands it — and makes it available to phase into another realm of information.

What you do with what you saw — that is the integration. That is where the journey continues.

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May Love Guide The Heart of All Beings.Doug Red Hail Pineda · Founder, The Church of Psychedelics