My little head-canon: metamorphoses of ponies' mind and body · 6:47pm May 18th, 2014
You all remember Nightmare Moon transformation (S04E01-02), don't you? Also, I think you all remember how Fluttershy changed when her mind was affected by Twilight's spell (S04E07), and how Pinkie's hair changed when she become crazy (S01E25), and how mane6's pelts became dull when their mind was discorded, and even Twilight's pelt, when she gave up (S02E01-02)...
I think I know how to explain it. Ponies are highly magical species, and their bodies are highly ductile, and the state of their mind strongly affects their form. When Luna gone loco, her body changed to adapt her new state of mind. Same for other cases.
Maybe mind-altering magic or hypnosis can also help heal crippled ponies, but I'm not sure about it.
that's a pretty brilliant observation.
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Why thank you, good sir! I hope you'll find my other blog posts equally or even more enlightening!