This brings us to the end of my exposition of Einstein's Special Theory of Relativity (SR). I have attempted to explain everything that is usually explained using equations using drawings only so that you can literally see what I am talking about. I hope you have found this approach more tractable, eye-opening, and fun.

Partly because of its name, Einstein's “Theory of Relativity” is often misunderstood to have discarded Newton's notions of space and time that were both “objective” and “absolute,” and to have pronounced that both space and time were “relative,” and even “subjective” concepts. In truth, Einstein was a firm believer in objective reality, and SR assumes the existence of an “objective” and “absolute” spacetime. All SR is claiming is that when the motion of objects in spacetime is observed from different inertial frames, things like velocity and length will be frame-dependent. And this dependence comes about because the way the time- and space-axes are introduced into the “absolute” spacetime differs from inertial frame to inertial frame. The frame-dependence of the time-axis already existed in Newton's theory, and as a consequence velocity, not surprisingly, was frame-dependent. In SR, however, in addition to a frame-dependent time-axis, the concept of simultaneity depends on the frame and results in a frame-dependent space-axis also.