Gravity is the evidence of space pushing on or against matter as it travels through it. For example, you feel your back press into the seat of the car when it is accelerating. The sensation is gravitational but the phenomena is resistance.
Any object that is not firmly attached or at rest on a supporting object will be pushed by space giving one the impression that the apple is falling, the ball rolling, or the water is running. The push or resistance is the aggregate motion of the cosmos expanding, the galaxy flying and rotating, the solar system advancing, and as the planets orbits and spins.
The paradigm shift is to conclude that space is in fact the unifying force in the cosmos and everything else is acted upon by it. Space is ubiquitous and omnipresent. The so called dark matter is the antithesis of space and in conjunction with space composes all matter. Dark matter is a bubble in space and matter is the aggregation of bubbles. The bubbles are precipitated by vibrations easily aggregated or may exist in clumps which translates into physical matter. As the matter travels through space the sensation of gravity is encountered.
i.e. gravity doesn't really exist it only seems as if it does.
String theory should actually be bubble theory. Strings are 2D images of bubbles.
This post was motivated by Erik Verlinde's post in Big Think August 2010, I have long held the belief that gravity doesn't really exist, but didn't have the credibility to suggest it. Finally someone that does, did.