Once force is imagined as interaction rather than unilateral action, another question naturally arises. What is it that makes the interaction possible?
The previous essay suggested that agency need not belong exclusively to one object acting upon another.
It may instead reside within the organised relation established between them.
The metaphor of exchange carries this thought a stage further.
The relation itself begins to be imagined through what passes between the participants.
The image is immediately suggestive.
To exchange is to give and receive.
Something moves.
Something is transferred.
The participants are connected through this movement.
The relation is no longer simply an encounter.
It becomes a process of transmission.
This represents another quiet transformation in the imagination of force.
Earlier metaphors organised agency around objects.
Later, around relations.
Now attention begins to settle upon the movement that constitutes the relation itself.
The imagination has found a new explanatory centre.
The exchange need not always be pictured in the same way.
Different physical theories have imagined different things passing between interacting bodies.
The details are not our concern here.
What matters is the conceptual picture.
Force becomes intelligible through transmission.
This changes the character of explanation.
To understand an interaction is no longer only to describe the participants.
Nor simply to describe the relation they establish.
It becomes natural to ask what is exchanged.
The imagination seeks a medium of intelligibility.
Another consequence of this metaphor is a reorganisation of agency.
Agency no longer appears as something possessed by one participant or even by the relation alone.
It increasingly appears through the ongoing movement that connects them.
The explanatory emphasis shifts once again.
The metaphor also changes the way continuity is imagined.
An exchange unfolds.
It has a direction.
It has a course.
It may begin, continue, and conclude.
Agency is therefore pictured less as a static property than as an organised process.
The imagination becomes increasingly dynamic.
At the same time, the metaphor imports assumptions that can easily become invisible.
One of these is the assumption that relations are constituted through transmission.
The interaction is no longer conceived simply as an abstract connection.
Its intelligibility lies in what passes between the participants.
Movement itself becomes explanatory.
Another assumption concerns reciprocity.
Exchange naturally suggests participation by more than one contributor.
Even where the exchange is not symmetrical, the metaphor encourages thinking in terms of organised mutual involvement rather than isolated acts of agency.
The relation becomes increasingly collaborative.
A further implication is that agency acquires a mediating character.
What matters is no longer only the participants.
Nor solely the relation they establish.
Attention increasingly turns toward the process that joins them.
The imagination has shifted again.
Taken together, these features make the metaphor of exchange a powerful extension of physical thought.
It preserves the relational imagination introduced by interaction.
Yet it enriches that imagination by asking how the relation itself becomes physically intelligible.
The explanatory burden now rests upon organised transmission.
As with every successful metaphor in this series, familiarity gradually conceals the work it performs.
Exchange begins to seem an entirely natural way of thinking about force.
Its imaginative origins quietly disappear.
The metaphor becomes transparent through use.
At that point, something subtle has occurred.
The question is no longer simply,
Which bodies interact?
Nor even,
What relation do they establish?
It has become,
What passes through that relation?
The imagination of force has migrated once again.
Agency now appears through organised transmission.
The question, then, is not whether exchanges occur.
Nor is it whether this metaphor has proved scientifically fruitful.
Its influence upon modern physical thought is unmistakable.
The more interesting question is what forms of explanation become possible once force is imagined through processes of exchange.
What kinds of reasoning does this image encourage?
And what possibilities become easier to perceive while it quietly reorganises physical imagination?
We will not attempt to answer those questions here.
Instead, we simply note that the imagination of force would continue to evolve.
Attention would gradually shift away from what passes between interacting bodies.
It would increasingly turn towards the organised surroundings within which interactions occur.
Force would come to be imagined as field.
And with that shift, the conceptual landscape would change once again.
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