I am trying to sharpen the convex hull of what seems like a (surprisingly) stubborn concept to enclose based on answers here, as well as conversations with others, around the nature of what actually constitutes a computation.
As a motivating scenario for the question, consider the following:
Around some distant star in a some faraway godforsaken galaxy, exists a boring gas cloud. Here, two protons careen towards each other on an inevitable collision course. The protons' repel each other, and their trajectories inevitably change and off they go.
Has a computation taken place?