This article examines wave-particle duality and the double slit experiment, offering a detailed explanation of the physical phenomena at a fundamental level. It highlights that constructing a double slit model with macro-objects, rather than atomic structures, fundamentally limits accurate representation of the underlying principles involved. Foamy Ether Theory [1] offers a more realistic model, describing how the gravitational disturbance of a particle or photon travels through the entire wall of a double slit apparatus, not just the two slits.It is well known that gravitational waves travel through matter unimpeded. Each particle or photon is accompanied by its own gravitational disturbance (or wave) as it travels through space. Foamy Ether Theory (FET) asserts that these gravitational disturbances are equivalent to pilot waves that are described in De Broglie—Bohm theory [2].Snapshots of simulations are presented that illustrate how these gravitational disturbances propagate through the foamy ether and through the walls of a double slit apparatus, thereby causing gravitational interference patterns to emerge. A single particle or photon also creates an interference pattern because it is riding on its own gravitational (pilot) wave, as it travels through both the slits and the walls.