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## Main Question or Discussion Point

I'm still very early on in my reading, so forgive me if this question isn't coherent. In the "historical introduction" section of the 1920 University of Calcutta translation of the original papers of Einstein and Minkowski available via the MIT online archive, mention is made of the fact that "in the spacetime reality, relative motion is reduced to a rotation of the axes of reference," but no mathematical or graphical representation of this concept is given. Does this imply that the velocity (this isn't a good word for what I mean here but it's the best I could d ) of an object relative to an assumed stationary point can be described by a 4 component vector (3 space components and one time) with magnitude c such that the combined magnitude of the 3 spatial components defines the "observed spatial velocity" of the object?