Why Do So Many Cultures Share Similar Symbols?

The Pattern That Needs Explaining

Before getting into theories, it's worth being precise about what actually needs explaining, because 'cultures share similar symbols' covers several different phenomena that don't all have the same cause.

Some shared symbols are the result of direct contact and borrowing. The eagle as a symbol of imperial power moved from Rome to the Byzantine Empire to the Holy Roman Empire to Napoleonic France to the United States, in a documented, traceable line of cultural transmission — there's no mystery here, just influence and imitation across connected societies. The same is true of many symbols that spread along the Silk Road, through the Islamic world's connections between Spain and Central Asia, or through the colonial and missionary movements of more recent centuries. This is not what people usually mean when they marvel at 'universal' symbols, but it accounts for a lot of apparent similarity that has a boring, documentable explanation.

The genuinely interesting cases are the ones where there's no plausible route of contact: Mesoamerican, Egyptian, and Chinese pyramid- or mound-building traditions that developed with no known connection between them; flood narratives appearing from Mesopotamia to the Hebrew Bible to Hindu, Greek, Chinese, and numerous Indigenous American traditions; the widespread image of a cosmic or world tree; sun worship and sun-wheel imagery on nearly every continent; and the ouroboros appearing independently in Egypt, Greece, Scandinavia, and India. These are the cases that actually require an explanation beyond 'they copied each other,' because in several instances we have reasonably good evidence the cultures involved had no contact at the relevant period.

It also helps to notice what counts as a genuine match rather than a loose one. A generic circle or a generic tree isn't remarkable on its own — nearly any culture that draws will eventually draw a circle. What's actually striking is when the specific combination of details lines up: a serpent specifically eating its own tail, rather than just any serpent; a flood specifically survived by a small group in a boat or ark, rather than just any flood story; a tree specifically understood to connect three distinct vertical realms, rather than just any tree. It's this level of specific structural detail recurring independently that any serious explanation has to account for, not the mere presence of shared broad categories like 'sun symbol' or 'animal symbol,' which are unremarkable on their own.

The Jungian Explanation: Archetypes and the Collective Unconscious

Carl Jung, the Swiss psychiatrist, proposed in the early twentieth century that humans share a 'collective unconscious' — a layer of the psyche below individual experience, common to the whole species, populated by 'archetypes': recurring patterns of image and story (the Hero, the Great Mother, the Trickster, the Wise Old Man, the Shadow) that surface independently in myths, dreams, and religious symbolism across unconnected cultures because they are, in Jung's account, literally built into the structure of the human mind, inherited the way instincts are inherited.

On this view, the ouroboros appears independently in multiple cultures not because anyone copied anyone else, but because the image of self-consuming, self-renewing cyclicality answers to something already present in the human psyche — an archetype of eternal return or wholeness that will surface in symbolic form wherever humans reflect deeply on time, death, and renewal, regardless of geography.

The theory is genuinely influential — it shaped a huge amount of twentieth-century comparative mythology, most famously Joseph Campbell's work on the 'hero's journey' pattern across world mythology — but it's worth being honest about its limits: the 'collective unconscious' as a literally inherited psychic structure has not been validated by modern neuroscience or genetics, and many contemporary scholars treat archetypal theory as a useful descriptive framework rather than a proven biological mechanism.

The More Grounded Explanation: Shared Experience and Constraints

The alternative explanation doesn't require any inherited psychic structure at all — just the observation that humans everywhere face broadly similar problems, using broadly similar bodies and senses, in a world governed by the same physics, and tend to reach for broadly similar solutions. Every human culture experiences the sun rising and setting as the single most visually dominant, life-sustaining object in the sky, which makes independent sun symbolism unsurprising rather than mysterious. Snakes are found on every inhabited continent, are genuinely dangerous in memorable ways, and visibly shed their skin — a directly observable behaviour that independently suggests renewal to anyone who watches it, no shared psychic inheritance required.

Flood myths admit an even more specific grounded explanation: many early civilisations arose in flood-prone river valleys and coastal plains, and a society that has experienced or inherited oral memory of a genuinely catastrophic flood has an obvious, non-mysterious reason to develop a flood narrative independently. Trade and migration provide a third mechanism: humans have moved and exchanged ideas across longer distances, earlier, than once assumed, meaning some 'independently developed' symbols may share a traceable, if distant, common origin after all.

Holding Both Without Overclaiming

The honest position is that neither explanation alone accounts for everything. Jung's framework remains a useful interpretive lens for naming genuinely recurring patterns, even if his specific biological claim remains unproven. The grounded explanation accounts for a very large share of apparent symbolic universality without requiring any exotic mechanism, and should generally be reached for first as the simpler, better-evidenced explanation.

What's not defensible is the popular claim that specific symbols carry one single, fixed, universal meaning hardwired into every human mind. The real picture is messier: broadly similar symbols recurring for a mix of environmental, experiential, and contact-related reasons, arriving at meanings similar in outline but genuinely different in cultural detail — the ouroboros means something recognisably related but not identical in Egyptian alchemy, Norse cosmology, and Hindu philosophy, and that combination of convergence and specificity is more accurate, and more interesting, than either 'universal archetype' or 'pure coincidence.'