  General theory of relativity (or Lovelock extensions) is a dynamical theory;
given an initial configuration on a space-like hypersurface, it makes a
definite prediction of the final configuration. Recent developments suggest
that gravity may be described in terms of macroscopic parameters. It finds a
concrete manifestation in the fluid-gravity correspondence. Most of the efforts
till date has been to relate equilibrium configurations in gravity with fluid
variables. In order for the emergent paradigm to be truly successful, it has to
provide a statistical mechanical derivation of how a given initial static
configuration evolves into another. In this essay, we show that the energy
transport equation governed by the fluctuations of the horizon-fluid is similar
to Raychaudhuri equation and, hence gravity is truly emergent.
