It was featured in the 2011 National Geographic Photo Contest.
The photographer, Don Chamblee, captured the inside & outside of a moving streetcar simultaneously.
The result is a strikingly simple visual representation of the Theory of Relativity.
Although there's alot of calculus in Einstein's famous formulation, it's basically the recognition that every mind is an independent point of reference. Each person's singular manifestation of consciousness in space & time defines that particular experience.
The thing that's hard for most people to wrap their heads around is that Reality and Consciousness have been experimentally proven to interact. It is not a one-way street, from external cause to our affected perceptions.
We are part of a interconnected Unity... manifested for a short time as a process that we recognize as the form of individual human beings.