Case study
Make an abstract distinction visible through a change.
The companion turns the essay’s comparison between Aristotle and Data Vault into a small laboratory with an object, controls and a live database log.
The learning problem
Identity, relationships and changing properties are easy to blur together when they remain abstract terms. The page places Substance, Relation and Accident beside Hub, Link and Satellite, then makes the visitor change a concrete object.
Controls that isolate the idea
Paint Object changes a property. Move Object changes location. Cycle Relationship changes a connection. Replace Substance creates a new identity. Each control isolates a different part of the comparison instead of asking the learner to absorb the entire model at once.
Feedback beside the experiment
The database log is shown in the same view as the object. Hub, Link and Satellite tables let the visitor connect an action to the kind of record it produces, and Reset Simulation makes the sequence repeatable.
An analogy with its own limits
The companion supports the article’s philosophical comparison; it is not a full Data Vault implementation. Its concrete result is an explorable learning model that can be tried directly in the portfolio.