"Works on my machine" is not a joke but an ontological problem. Dev, staging, UAT, and prod are each caves with their own shadows — and the tester's job is to work out which projections can be trusted as evidence about the form beyond.
Test Environments as Platonic Shadows. "Works on my machine" isn't a joke, it's an ontological problem. Dev, staging, UAT, prod — each is a cave with its own set of shadows. Plato's cave[^1] maps with almost embarrassing precision. This piece could sit beside Perturbation Theory as another "borrowed-framework" essay and give you a natural home for your AWS HealthImaging / cross-manufacturer DICOM work, where the "same" data behaves differently in different environments.
