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I've been on multiple threads that attempt to explain this celebrated theory, but I have come across some rather complex threads that is very good if you are a physicist, but no one even attempts to explain this in layman terms, so here goes:

How to explain Special Relativity to a 3 year old?

The way I see it, the average person's understanding of this theory is as good as the next person. So his understanding of this concept would be the equivalent to that of a 3 year old child.

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    $\begingroup$ related: physics.stackexchange.com/q/31/58382 $\endgroup$
    – glS
    Commented Dec 26, 2014 at 11:02
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    $\begingroup$ Let him/her play the game ''slower speed of light''. $\endgroup$
    – Paul
    Commented Dec 26, 2014 at 11:03
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    $\begingroup$ You will find that after only a very few questions starting with "Why" you will be at the frontiers of ignorance. Why is the speed of light constant? BECAUSE IT IS! $\endgroup$
    – user56903
    Commented Dec 26, 2014 at 11:07
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    $\begingroup$ You first explain him the Galilean relativity. Tell him that when you both are in a train, despite that the train is moving, the child sees through the window that the trees move, the houses move. So, movement is relative. After that, to come to the special relativity is a long and slow way. $\endgroup$
    – Sofia
    Commented Dec 26, 2014 at 11:54
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    $\begingroup$ Query: has some 3-yr old actually asked this, and if so, where did xe hear about relativity, or even light speed? If you're just pondering, then my recommendation is to wait until after they've at least grasped concepts like "what goes up must come down" and "big things push little things around" first. :-) $\endgroup$
    – Carl Witthoft
    Commented Dec 26, 2014 at 12:34

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