Abstract: This disclosure presents and claims means for the modification of local gravitation by modifying its direction of action and presents and claims various uses of those means. The new technology involved is the recognition that light and gravitation flow in the same common medium; that the observed effects of gravitational lensing and light diffraction demonstrate the gravitational field of atoms deflecting the flow of that common medium of light and gravitation; that a suitable arrangement of atoms consequently could produce a desired deflection of gravitation; and that the atomic structure of a cubic crystal [for example Silicon] is suitable for that application. That deflection of gravitation and its effects are then used to drive spacecraft an flying vehicles.