Evolutionary explanations often sound physical.
We hear about:
- selection pressures
- evolutionary forces
- adaptive drives
- constraints acting on populations
The vocabulary borrows heavily from mechanics.
But this borrowing is not neutral.
It quietly imports a causal architecture that evolution does not require.
0. The Intuitive Picture: Forces Acting on Things
In classical mechanics, causation is often imagined as:
forces acting on objects, producing change
This model includes:
- entities that persist (objects)
- forces that act upon them
- interactions that generate movement or transformation
It is a powerful and precise framework—for physics.
But when imported into evolutionary discourse, it reshapes how processes are imagined.
1. The Language of “Selection Pressure”
Consider the phrase:
selection pressure
It suggests:
- an external force acting on a population
- pushing it toward certain outcomes
- shaping its trajectory over time
This metaphor is so entrenched that it often goes unnoticed.
But what is actually being described?
Not a force in the physical sense.
Rather:
a statistical regularity in which certain variants persist more successfully than others under given conditions
There is no pushing.
There is no directing.
There is only:
differential continuation across a structured field of variation
2. What the Force Metaphor Adds
The “force” metaphor contributes:
- a sense of directionality
- an intuitive causal mechanism
- a story of interaction between entities and influences
It allows us to say:
“the environment exerts pressure on organisms”
But this phrasing risks reifying the environment into:
an agent-like entity applying influence
Whereas what is actually present is:
- a set of conditions
- within which certain configurations persist more readily than others
No force is required to describe this.
3. The Residue of Mechanistic Thinking
The persistence of force-based language reflects a deeper inheritance from mechanistic worldviews.
In that worldview:
- entities are acted upon
- forces transmit influence
- change is the result of interactions between discrete objects
Evolutionary theory, however, operates differently.
It does not primarily describe:
interactions between objects under force
It describes:
distributions of variation under constraints of persistence
The “movement” we observe is not driven by a force in the system.
It is the changing composition of what continues to exist.
4. Rethinking Causation Without Forces
If we remove forces from the picture, what remains of causation?
Not nothing—but something less intuitive.
Causation becomes:
the structuring of conditions under which certain outcomes are more likely to persist than others
In this framing:
- causes are not pushing events into existence
- they are configurations that enable or inhibit continuation
So instead of:
force → effect
we have:
configuration → differential persistence
This is less cinematic, but more precise.
5. The Case of “Adaptation”
“Adaptation” is often described as if organisms are being shaped by external pressures.
But without forces, adaptation can be reframed as:
the accumulation of variants that persist under recurring constraints
No organism is being “pushed” toward a goal.
No environment is “driving” a response.
What we observe is:
a stabilised alignment between a configuration and its conditions of persistence
6. Why Force Language Persists
Force-based language persists because it:
- preserves a sense of intelligibility
- aligns with everyday causal intuitions
- compresses complex distributions into simple narratives
It allows us to speak as if:
something is doing something to something else
Even when the underlying description does not require such an ontology.
7. The Cost of the Metaphor
The cost is subtle but significant.
Force metaphors tend to reintroduce:
- directional causation with implicit targets
- external drivers acting on passive entities
- a layered structure of influence and response
This can lead to explanatory habits where:
we mistake a pattern of persistence for the effect of a driving influence
In doing so, we risk attributing agency or quasi-agency to abstract conditions.
8. A Non-Force Alternative
A cleaner description avoids force altogether:
Variation exists within a structured set of conditions.Some variants persist longer or reproduce more successfully than others under those conditions.Over time, the distribution shifts toward those that persist.
No force is invoked.
No push is required.
No driver is needed.
Only:
differential persistence across structured variation
9. Causation as Constraint, Not Impulse
In this reframing, causation is better understood as:
the role of constraints in shaping which configurations can continue
Constraints are not forces.
They do not act.
They delimit possibilities.
They define:
- what can persist
- what cannot
- and under what conditions transitions occur
Causation becomes:
the organisation of possibility space, not the transmission of force
10. What Gets Rewritten
Removing forces rewrites several familiar phrases:
- “selection pressure” → structured conditions of differential persistence
- “driven by the environment” → persistence shaped by environmental constraints
- “adaptive response” → stabilised configuration under recurring conditions
None of these require a force.
They require only:
variation, constraint, and persistence
Closing Reflection
Force language makes evolution feel like a process with momentum.
But the phenomena themselves do not require momentum in that sense.
What we observe is not:
a system being pushed through time
but:
a shifting distribution of what continues to exist under changing constraints
Once forces are removed, the narrative loses its sense of propulsion.
What remains is quieter, but more exact:
not a world of things being driven,but a world of configurations that persist or do not.
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