Or anything is theoritical, possibly?

Going multicultural, I supose it could be argued that its all illusion anyway, so the door isn't really there. Or go with Xeno's paradox and agrue that the boat/skier would never reach the door to begin with.

Much more interesting, the thread on "The Prisoner" is diverged into Diana Rigg as Emma Peel. Truely worthy of more consideration

Regards John