Why we imagine aliens the way we do
Our depictions of aliens are shaped more by storytelling tradition and practical filmmaking constraints than by science. Even as visual effects technology improves, creators still anchor alien designs in familiar biological forms — because total strangeness is hard for audiences to accept as real. ---
Key Concepts
| Concept | Definition |
|---|---|
| Humanoid bias | The tendency to imagine aliens with recognizable human features (head, limbs, upright posture) rooted in practical and narrative convenience, not scientific reasoning |
| Design DNA | The inherited visual language of a franchise or prior alien design that new creatures are expected to reference for continuity and nostalgia |
| Nature as reference | Using real-world biology (deep-sea creatures, plants, cephalopods) as a design anchor to make truly alien forms feel tangible and believable |
| SETI proxy approach | Rather than speculating on alien biology, SETI searches for technology as a proxy for life, sidestepping the biological imagination problem entirely |
Notes
The Origins of Alien Imagination
- Our mental image of aliens is usually borrowed from books, films, and TV — the product of someone else's imagination
- *A Trip to the Moon* (Georges Méliès, 1902) is the first film featuring extraterrestrial life
- Its aliens look strikingly human — not because that's scientifically plausible, but because it was practical and ambitious for the time
- Early alien design defaulted to humanoid form partly due to casting: someone had to physically play the role
Why Humanoid ≠ Scientifically Accurate
- Human form is the result of several billion years of evolution on Earth
- There is no scientific reason to expect life elsewhere to follow a similar evolutionary path
- Andrew Siemion (Director, SETI Institute): no basis to assume alien life would resemble anything on Earth
The Storytelling Function of Alien Design
- Relatable alien features serve narrative purposes: they enable the central sci-fi theme of *us vs. them*
- Stories hinge on a point of contact — hostile or friendly — which requires some degree of mutual intelligibility
- Humanoid or emotionally readable aliens make it easier to explore questions like: Are they good or bad? What if they try to communicate?
Visual Effects and the Limits of Innovation
- More advanced VFX gives filmmakers more room to experiment, but breaking from familiar forms remains difficult
- **Design DNA** constrains even new creatures — e.g., the neomorph in *Alien: Covenant* was meant to be new but deliberately retained traits from the original xenomorph
- Franchise nostalgia reinforces continuity over radical reinvention
Breaking the Mold — and Why It's Hard
- *Edge of Tomorrow*'s "mimics" had a design brief rooted in the ocean and non-humanoid movement
- Challenge: if a creature doesn't follow recognizable rules, audiences struggle to accept it as tangible or real
- The trick is grounding new designs in real-world reference points
- Example: goblin sharks (deep sea) informed skin texture and jaw mechanics in alien designs
- *Arrival*'s heptapods: otherworldly but still evoke familiar cephalopod biology
- Groot (*Guardians of the Galaxy*): tree-like, not classical humanoid, but designed to read as friendly and functional
The Bigger Human Question
- Fictional alien depictions, however unscientific, still serve a purpose: they make us think about life beyond Earth
- Scientists, filmmakers, musicians, and ordinary people are all engaging with the same underlying question
Actionable Takeaways
- When evaluating alien depictions in media, ask whether the design choices are narrative/practical or scientifically informed — they're usually the former
- If designing or writing speculative creatures, use real-world biological outliers (deep-sea life, extremophiles) as anchors to make strange forms feel credible
- Treat science fiction alien design as a cultural artifact — it reveals more about human psychology and storytelling than about actual extraterrestrial life
Quotes Worth Keeping
The form of a human being is the result of several billion years of evolution. There's no reason to believe that the development of life would be so similar as it was on Earth.
If it doesn't follow rules, the mind will idle — and it's hard to sell it as something really tangible.
Some people draw pictures of it and some people make movies about it... but it's all part of the same human question, which is: are we alone?