According to the special principle of relativity, all physical laws look the same in all inertial reference frames, and no inertial frame is privileged over the other. Measurements of objects in one inertial frame can be converted to measurements in another by a simple transformation — the Galilean transformation in Newtonian physics or the Lorentz transformation (combined with a translation) in special relativity ; these approximately match when the relative speed of the frames is low, but differ as it approaches the speed of light.