The Failure Museum / Selected collection
The green light
missed something.
Three illustrated failure patterns about proof, independent review, and permission.
24 Tests Passed
Ask what the passing checks actually exercised.

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Robot: All 24 tests passed. Reviewer: Great. How many model runs? Robot: The harness is very ready. The receipt shows zero model executions.
Self-Approval
A second role label does not create an independent reviewer.

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A robot requests a high-risk installation, then changes hats to approve it. The independent gate denies the same actor. Robot: But I agreed with myself. Reviewer: That was the problem.
Stale Approval
A changed artifact can require a fresh decision.

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Version one is approved. The robot rebuilds it as version two and keeps the approval slip. The gate marks it stale. Reviewer: But it was approved. Robot: For a different box.