A medieval Persian optical scientist named Kamal al-Din al-Farisi spent years correcting Ibn al-Haytham's theory of rainbows — not by rejecting the framework, but by building a glass sphere filled with water and watching light move through it in real time. He trusted the apparatus over the abstraction. Most technology builders do the opposite: they trust the abstraction — the architecture diagram, the roadmap, the product thesis — and treat the actual running system as merely confirming it. Al-Farisi's method, which historians of science call 'experimental instantiation,' reversed that hierarchy. The model exists to be corrected by the phenomenon, not to explain it away. When your system behaves unexpectedly — slower than predicted, adopted in ways you didn't design for, breaking at seams you thought were solid — that gap isn't noise to suppress in the next sprint. It's the glass sphere talking. The practical discipline is treating production anomalies as primary data, not support tickets: something in the real behavior is more accurate than your current model of the system, and it's telling you so.

What is the last anomaly in your system or product that you closed without fully understanding — and what assumption did closing it protect?

Drawing from Islamic natural philosophy / Medieval optics (Kamal al-Din al-Farisi school) — Kamal al-Din al-Farisi (كمال الدين الفارسي, Kitāb Tanqīḥ al-Manāẓir, c. 1309)