They're clearly purposely being wishy-washy on the mystical vs. physical thing. But with the too coincidental overlap between survivors' backstories, a dripping wet backward talking Walt, and bizarre black cloud that can grab someone, I doubt they can have an entirely physical and "rational" explanation of the island. Weirdness abounds.
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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