So my summer school (Physics 11) teacher wants us to choose 3 special relativity concepts and draw 3 sperate comic strips on them.

So far I've only chosen time dilation and I basically finished that because that wasn't hard, but now I have to choose 2 more concepts and draw comic strips for them.

The concepts I've got left are:
-reference frames/frames of reference
-how simultaneous events for one observer aren't simultaneous for another.
-michelson-morley experiment
-the relativity principle
-constancy of speed of light
-why things can't exceed speed of light
-length contraction
-mass increase

Can you please choose one or two concept(s) and give ideas that I can use for my comic strips.

Thank you .