A Shipibo healer in the Peruvian Amazon drinks ayahuasca and sees geometric serpents winding through crystalline lattices. Three thousand miles north, a participant in a Johns Hopkins psilocybin study closes her eyes and describes nearly identical patterns—spiraling snakes, jeweled grids, tunnels of light. In a Melbourne laboratory, volunteers given DMT report entering the same “waiting room” with the same entities. They’ve never met. They come from different continents, different cultures, different centuries.
How do chemically distinct molecules—psilocybin from mushrooms, DMT from plants and the human brain, mescaline from cacti—unlock such remarkably consistent visionary experiences?
The Pattern That Keeps Appearing
ESTABLISHED FACT: Research documenting subjective effects of classic psychedelics shows striking cross-cultural consistency in reported visual phenomena. The same motifs appear across thousands of trip reports: geometric patterns (particularly hexagons, spirals, and tunnels), encounters with seemingly autonomous entities, experiences of ego dissolution, and profound feelings of interconnectedness.
ESTABLISHED FACT: Anthropologist Jeremy Narby documented that Indigenous Amazonian shamans from isolated tribes, working with different plant medicines, independently describe seeing double helixes, ladders, and serpentine forms—imagery that bears uncanny resemblance to DNA structure, despite these cultures having no exposure to molecular biology.
Benny Shanon, a cognitive psychologist who conducted extensive research on ayahuasca experiences, catalogued the visions of 2,500 participants. He found that certain images—jaguars, serpents, palaces, divine beings—appeared with statistical regularity far beyond chance. People who had never discussed their experiences, who came from radically different backgrounds, were seeing the same things.
What’s Actually Happening in the Brain?
ESTABLISHED FACT: Classic psychedelics (psilocybin, LSD, DMT, mescaline) are all 5-HT2A receptor agonists—they bind to and activate a specific serotonin receptor densely concentrated in the cortex, particularly in regions associated with perception, cognition, and sense of self.
Neuroimaging studies show that psychedelics don’t simply “activate” the brain—they fundamentally reorganize how different regions communicate. The default mode network (DMN), which maintains our sense of self and autobiographical continuity, shows decreased activity and connectivity. Meanwhile, regions that don’t normally talk to each other begin forming novel connections.
INFORMED SPECULATION: Robin Carhart-Harris, former head of psychedelic research at Imperial College London, proposed the “entropic brain hypothesis”—that psychedelics increase the brain’s entropy, or disorder, allowing it to explore a wider state space of possible configurations. This might explain the dissolution of ordinary perception and the emergence of novel patterns.
But this doesn’t fully explain the specificity of the visions. Why serpents and not bears? Why geometric tunnels and not clouds? Why do people report meeting the same entities?
The Form Constants Hypothesis
ESTABLISHED FACT: In the 1920s, neurologist Heinrich Klüver studied mescaline experiences and identified recurring “form constants”—geometric patterns that appeared consistently across subjects. He catalogued four types: tunnels and funnels, spirals, lattices and honeycombs, and cobwebs.
INFORMED SPECULATION: These patterns might reflect the brain’s underlying architecture. The visual cortex is organized in columns and layers with specific geometric arrangements. When psychedelics disrupt normal processing, we might be “seeing” the brain’s own structure—the scaffolding usually hidden behind the content of perception.
Neuroscientist Jack Cowan developed mathematical models showing that the geometry of cortical connectivity could generate exactly the patterns Klüver described. Migraine auras, which also involve visual cortex disruption, produce similar geometric hallucinations.
But this elegant explanation has a problem: it accounts for the geometry, but not the content. It doesn’t explain the entities, the narratives, the sense of encountering intelligence.
Are We Accessing Something Real?
INDIGENOUS TRADITION: For thousands of years, Indigenous cultures have maintained that plant medicines provide access to genuine realms and beings. The Shipibo speak of the “plant teachers.” Mazatec curandera María Sabina described psilocybin mushrooms as revealing “the world where everything is known.” These aren’t metaphors in their worldview—they’re descriptions of ontologically real experiences.
Terence McKenna famously argued that DMT entities might represent genuine contact with non-human intelligence. “These are not hallucinations,” he insisted. “This is an actual place, and these are actual beings.”
UNANSWERED: The materialist explanation—that these experiences are purely neurochemical artifacts—struggles with the consistency problem. If they’re just random neural noise, why the patterns? Why do people separated by continents and centuries report the same encounters?
But the alternative—that psychedelics provide access to objective alternate realities—raises equally challenging questions. If these realms are real, where are they? How does a molecule grant access? Why would evolution have equipped us with receptors that open doors to other dimensions?
The Jungian Interpretation
INFORMED SPECULATION: Carl Jung proposed that beneath individual consciousness lies a collective unconscious—a shared repository of archetypal images and patterns inherited across humanity. Psychedelics might grant access to this deeper layer.
This could explain why the visions feel both deeply personal and universally recognizable. The serpent, the wise elder, the divine feminine, the trickster—these aren’t learned but inherited, encoded in the structure of the psyche itself.
Anthropologist Michael Winkelman suggests that shamanic practices across cultures access “neurognositc structures”—universal patterns of knowing built into the nervous system. Psychedelics might be one technology for accessing these structures.
But this still leaves questions. Are archetypes real in any sense beyond being useful psychological models? And if they’re just in our heads, why do they feel so other?
The Information Theory Angle
INFORMED SPECULATION: Some researchers propose that psychedelics might enhance the brain’s ability to detect and process information that’s normally filtered out. Our ordinary consciousness is highly constrained—we perceive a tiny slice of available information, filtered through models built from past experience.
Neuroscientist Karl Friston’s “predictive processing” framework suggests the brain is constantly generating predictions about sensory input. Psychedelics might relax the precision of these predictions, allowing raw data to flood in. The consistent visions might reflect actual patterns in this data—structures in the information field that we normally can’t perceive.
This is speculative, but it offers a middle path: the experiences aren’t purely subjective hallucinations, nor are they visits to alternate dimensions. They’re perceptions of information patterns that are always present but usually invisible.
What About the Entities?
FIRSTHAND ACCOUNTS: The encounter with seemingly autonomous beings is one of the most consistent and startling aspects of high-dose psychedelic experiences, particularly with DMT. People report beings that seem to have their own agency, personality, and often, a message to convey.
Andrew Gallimore, a neuroscientist who studies DMT, notes that these entities often seem to recognize the visitor—as if they’ve been waiting. They communicate through gesture, telepathy, or by showing rather than telling. Many experiencers report that the entities seem more real than ordinary reality.
UNANSWERED: Are these entities aspects of our own psyche—dissociated parts of ourselves that we meet as if they were other? Are they emergent properties of complex neural dynamics? Are they inhabitants of a genuine alternate reality? Or are they something else entirely—perhaps a category our current ontology doesn’t have room for?
The philosopher Peter Sjöstedt-H suggests we might need new frameworks entirely. Perhaps the question “are they real or imaginary?” is itself the wrong question, based on a false dichotomy. Maybe there are modes of existence that don’t fit neatly into either category.
The Consistency Across Molecules
Here’s what makes the mystery deeper: psilocybin, DMT, mescaline, and LSD are chemically distinct. They have different molecular structures, different pharmacokinetics, different durations of action. Yet they produce remarkably similar phenomenology.
ESTABLISHED FACT: What they share is 5-HT2A receptor agonism. This suggests the receptor itself—or the neural cascades it triggers—is the key. But a receptor is just a lock. These different molecular keys open the same door, but what’s on the other side?
INFORMED SPECULATION: Perhaps 5-HT2A activation disrupts the brain’s normal filtering mechanisms in a specific way—one that reliably produces access to certain states or information patterns. The consistency might reflect not arbitrary neural noise, but the structure of consciousness itself when freed from its ordinary constraints.
The Cultural Transmission Question
Skeptics might argue that the consistency is due to cultural transmission—people read trip reports, absorb expectations, and then experience what they expect. This is a fair concern.
ESTABLISHED FACT: Expectation profoundly shapes psychedelic experiences. Set and setting matter enormously. People primed to expect spiritual experiences are more likely to have them.
But this doesn’t explain the cross-cultural consistency in pre-internet Indigenous traditions. Shipibo shamans weren’t reading Terence McKenna. Mazatec curanderas weren’t browsing Erowid. Yet their reports contain the same core elements.
Moreover, first-time users with no prior knowledge—including participants in clinical trials who are deliberately kept naive—still report the classic patterns. The cultural transmission hypothesis explains some of the consistency, but not all of it.
What Physics Might Tell Us
INFORMED SPECULATION: Some theorists draw on quantum mechanics and consciousness studies to propose that psychedelics might alter the brain’s relationship to fundamental aspects of reality.
Physicist Matthew Fisher has explored whether quantum processes might play a role in consciousness. If consciousness involves quantum coherence in neural microtubules (as Penrose and Hameroff have controversially proposed), perhaps psychedelics affect these quantum processes.
This is highly speculative and not widely accepted. But it gestures toward a possibility: that psychedelics might reveal aspects of reality that are always present but normally imperceptible—not through mystical magic, but through altered physical processes we don’t yet fully understand.
The Limits of Current Science
ESTABLISHED FACT: We can measure brain activity during psychedelic experiences. We can identify receptor binding, track blood flow, map connectivity changes. What we cannot do is explain why particular patterns of neural activity produce the specific subjective experiences they do.
This is the “hard problem of consciousness”—the explanatory gap between objective brain states and subjective experience. Psychedelics make this gap glaringly obvious. We can describe what the brain is doing, but not why it feels like meeting entities in crystalline palaces.
Neuroscientist Christof Koch, who has spent decades studying consciousness, admits: “We have no idea how neurons give rise to subjective experience. Psychedelics make this mystery impossible to ignore.”
A DSS Reflection
At DSS, we believe that some mysteries are worth sitting with—not because we fetishize ignorance, but because premature closure prevents genuine understanding. The consistency of psychedelic visions across cultures and molecules points to something real, but what that something is remains genuinely open.
Perhaps these experiences reveal the brain’s architecture. Perhaps they access a collective unconscious. Perhaps they perceive information patterns normally filtered out. Perhaps they contact genuinely other intelligences. Perhaps all of these are partial truths, facets of something larger than any single framework can capture.
What we do know is that millions of people across history have encountered these patterns and beings, and many report that the encounters were among the most meaningful experiences of their lives. They describe receiving teachings, healing from trauma, understanding their place in the cosmos. Whether the entities are “real” in a conventional sense might matter less than the reality of the transformation they catalyze.
The mystery invites us to hold multiple possibilities simultaneously—to be rigorous about what we know while remaining open to what we don’t. It asks us to respect both scientific investigation and Indigenous wisdom, to honor subjective experience while maintaining epistemic humility.
Perhaps the consistency of the visions is itself the message: that consciousness, when freed from its ordinary constraints, reliably encounters certain patterns. And perhaps those patterns are trying to teach us something about the nature of mind, reality, and our place in the larger whole.
The Question That Remains
So we return to where we started, with a question that has no easy answer: Why do chemically distinct molecules, acting on the same receptor, reliably produce encounters with the same geometric patterns and seemingly autonomous beings across unconnected cultures and centuries?
The answer might reshape our understanding of consciousness itself. It might reveal that the brain is not generating consciousness but filtering it. It might show that certain patterns are fundamental to the structure of mind. It might demonstrate that reality has more layers than our ordinary perception reveals.
Or it might teach us that the question itself needs to be reframed—that we’re asking in categories too small to hold the answer.
What do you think you’re encountering when you close your eyes and see the patterns? And how would you know?