Carver Mead's Theory of Gravity

Newtonian equations for electromagnetism, or rather I should just say, electrostatic charge interactions, is identical to the Newtonian math for gravity. You can see that there's a gravitomagnetic analogy to electromagnetISM full of mass currents that are equivalent to electrical currents and all the rest. But the parallel only seems to hold true in the weak field limit, where the gravitational field is very strong and the motions aren't anywhere near the speed of light.