A confluence of code, chronicles, and my thoughts.
Explore functional programming in Java, Clojure, and F#.
Delve into the history and uncover the stories that shape our craft.

Every glitch reveals a deeper understanding.

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— I’m Stefan von Stein.

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Latest at 2026-01-30:


Own the Model of Reality

Ontology is the branch of philosophy that studies existence.
If you don’t own your ontology, you don’t own your model of reality.
If you don’t own your model of reality, you don’t own the decisions you make.

AI makes this painfully clear.

Ontology Ownership Is Invisible Until It Fails

The HR system defines the employee.
The CRM defines the customer.
The project tool defines the assignment.

None of these are the truth.
They are system-specific representations of reality.

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