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That analogy only seems to work in a system where everything is moving. If two objects are at rest relative to each other they are still attracting each other right?

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Even stationary objects will feel pressure to move towards the lower density region, so ww520's analogy still works.

It would even refract light. I'd never heard of this mental model, very interesting.

Maybe it works if you imagine everything moving, and stasis is simulated by running in circles?

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