Week 11: The screen

One situation shown on the same pit wall twice — every quantity at full precision, then five lines and the objective named — and the measurement that separates them

17 May 2027

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Your instrument no longer answers with a number. Week 9 propagated everything uncertain into a distribution over finishing positions; week 10 settled which objective that distribution is being ranked under, and whose interest it serves. Neither result fits on a screen a person reads in the seconds a call allows.

So something is discarded on the way to the wall — the display a strategist actually reads — and which thing you discard is the week. A display is a lossy compression of a distribution, and the design decision is what you choose to lose.

This is also the week that makes the course’s doctrine followable. You may not overrule your instrument on instinct, and under time pressure you can act only on what is legible. A probability the screen does not surface is one you will not use; you will act on instinct instead. The display is what makes trusting your own model physically possible.

You leave the lab with a display configuration and measured evidence that a correct call can be made from it inside the time limit: decision latency and correctness, for your wall and for a supplied baseline, side by side. It is not marked on how it looks.

The lecture builds one situation — lap 31, four stop laps still open — and shows the same wall twice. Once with every quantity the model produces, at full precision. Once with five lines and the objective named. In between: four honest ways to compress a distribution, and what each hides. Then it measures both walls, splits the difference into finding the number and comparing it, and ends on a scenario where the headline points the other way from the objective, and the call goes wrong. Every figure in it is a scenario value.

Everyone works the same pit wall: same screens, same setup, same seat. The environment is held constant so that what varies between two students is what they chose to put where — the only reason the measurement means anything.

One value on that screen is a probability you cannot yet audit; week 12 is where you find out whether it deserved the space.

The lab is where the configuration is written and both timed runs are done, inside the session. The wall you design here is submitted with the instrument and marked inside it, at 25 of its 100 criteria weight, never separately.